Alesis QuadraVerb 2 User manual

ALESIS
QuadraVerb2
Reference Manual

QuadraVerb 2 Reference Manual 1
Introduction
Thank you for purchasing the Alesis QuadraVerb 2 simultaneous effects processor.
To take full advantage of of the QuadraVerb 2’s fuctions, and to enjoy long and
trouble free use, please read this user’s manual carefully.
How To Use This Manual
This manual is divided into the following sections describing the various modes of the
QuadraVerb 2. Though we recommend you take time to read through the entire
manual once carefully, those having general knowledge about effects devices should
use the table of contents and index to reference specific functions while using this
device. If you are planning to use the Alesis optical digital I/O, read chapter 7 carefully.
Chapter 1: Setting Up. Deals with the necessary preparation before using,
including connections to other components, such as instruments, mixing consoles,
patchbays, multitrack recorders, as well as digital connections to ADAT.
Chapter 2: Your First Session with the QuadraVerb 2. A basic introduction
to getting the unit up and running, auditioning the factory Programs, adjusting levels,
comparing and storing edited Programs.
Chapter 3: Overview. A detailed look at the signal processing capabilities of the
QuadraVerb 2, and the concepts of multi-effect programming.
Chapter 4: Making Your Own Patches. A guided tour for programming typical
single and multi-effect applications.
Chapter 5: Description of Controls. A “dictionary” of all parameters, buttons
and connectors, including Global mode parameters.
Chapter 6: Advanced Applications. Advanced uses of the QuadraVerb 2,
such as MIDI functions, footswitches and using “tap tempo” to control delay times.
Chapter 7: Alesis Optical Interface. How the QuadraVerb 2 fits into an ADAT-
compatible studio.
Chapter 8: Trouble-Shooting. Contains the Trouble-shooting Index,
maintenance and service information, and MIDI implementation chart.
Conventions
The buttons, knobs, and rear panel connectors are referred to in this manual just as
their names appear on the QuadraVerb 2, using all capital letters and in brackets
( Examples: [PROGRAM] button, [< BLOCK] button, [VALUE/ENTER] knob/button,
[DIGITAL IN] connector, etc.).
J
When something important appears in the manual, an icon (like the one on the left)
will appear in the left margin. This symbol indicates that this information is vital when
operating the QuadraVerb 2.

2 QuadraVerb 2 Reference Manual

Contents
QuadraVerb 2 Reference Manual 3
CONTENTS
1: Setting Up..................................................................................................................7
Unpacking and Inspection.......................................................................................7
AC Power Hookup..................................................................................................7
Line Conditioners and Protectors................................................................7
Audio Connections.................................................................................................8
Typical Applications....................................................................................8
Interfacing Directly with Instruments.............................................................9
Interfacing to a Mixing Console....................................................................10
Avoiding Ground Loops..............................................................................15
MIDI .......................................................................................................................16
Alesis Optical..........................................................................................................16
Footswitches..........................................................................................................16
Advance....................................................................................................17
Bypass.......................................................................................................17
Tap Tempo.................................................................................................17
2: Your First Session With The QuadraVerb 2........................................................19
Powering Up..........................................................................................................19
Setting Levels........................................................................................................19
The Value/Enter Knob............................................................................................20
Adjusting the Display Contrast.....................................................................20
Auditioning Internal Programs..................................................................................21
Switching Between Preset and User Banks..................................................21
Example Programs..................................................................................................22
96: “VerbOfMyDreams”...............................................................................22
97: “Guitar Rack ”.......................................................................................22
98: “Stereo Plates”.....................................................................................22
Adjusting Effects Levels.........................................................................................23
Comparing an Edited Program to its Original Settings................................................24
Restoring an Edited Program to its Original Settings..................................................24
Storing Edited Programs.........................................................................................25
Bypassing Effects...................................................................................................26
Global Direct Signal Muting......................................................................................26
3: Overview....................................................................................................................27
The Architecture of the QuadraVerb 2......................................................................27
What is a Block?..........................................................................................27
Selecting and Editing Blocks.......................................................................27
Routing “Patch Cords” Between Blocks.......................................................28
Setting the Routing Levels..........................................................................29
The LR IN...................................................................................................29
Reaching the Outputs - LR OUT..................................................................29
Limit Handling.........................................................................................................30
Equalization...........................................................................................................32
Filters.........................................................................................................32
Shelving EQs.............................................................................................33
Single Band EQs........................................................................................33
Multiband EQs............................................................................................34
5 Band Graphic EQ .....................................................................................34
Resonator..................................................................................................35
Mono/Stereo Tremolo.................................................................................35
Stereo Simulator.........................................................................................35
Pitch Effects...........................................................................................................36
Mono Chorus.............................................................................................36

Contents
4 QuadraVerb 2 Reference Manual
Stereo Chorus............................................................................................36
Quad Chorus..............................................................................................37
Mono Flanging...........................................................................................37
Stereo Flanging..........................................................................................37
Phasor.......................................................................................................38
Mono/Stereo Lezlie Cabinet........................................................................38
Pitch Shifter...............................................................................................38
Pitch Detune..............................................................................................38
Ring Modulator...........................................................................................38
Delay .....................................................................................................................39
Mono Delay and Stereo Delay......................................................................39
Ping Pong Delay.........................................................................................39
Multi Tap Delay ...........................................................................................39
Tap Tempo Mono Delay and Ping Pong.......................................................39
Reverberation........................................................................................................40
Mono Room...............................................................................................40
Room 1......................................................................................................40
Hall 1..........................................................................................................40
Plate 1.......................................................................................................40
Chamber 1.................................................................................................40
Room 2......................................................................................................40
Hall 2..........................................................................................................40
Plate 2.......................................................................................................41
Chamber 2.................................................................................................41
Large Plate.................................................................................................41
Large Room...............................................................................................41
Spring........................................................................................................41
Nonlinear...................................................................................................41
Reverse.....................................................................................................41
Reverb Parameters.................................................................................................42
Decay........................................................................................................42
Damping – Hi & Lo ......................................................................................42
Reverb Density...........................................................................................42
Diffusion....................................................................................................42
Input High Frequency Roll Off......................................................................43
Predelay....................................................................................................43
Predelay Mix...............................................................................................43
Reflection Level and Spread.......................................................................43
Reverberation Swirl.....................................................................................43
Reverberation Attack..................................................................................43
Gating........................................................................................................44
4: Making Your Own Programs..................................................................................45
Getting Started.......................................................................................................45
Programming A Single Block...................................................................................46
Type..........................................................................................................46
Routing......................................................................................................47
Parameter ..................................................................................................49
Mix.............................................................................................................50
Programming Multiple Blocks...................................................................................51
Defining New Blocks...................................................................................51
Deleting Unnecessary Routings..................................................................51
Patching In The New Blocks........................................................................52
Adjusting Parameters..................................................................................53
Moving and Swapping Blocks..................................................................................53
Changing Effect Types...........................................................................................54
5: Description of Controls............................................................................................57
Front Panel............................................................................................................57

Contents
QuadraVerb 2 Reference Manual 5
Input Level.................................................................................................57
Output Level..............................................................................................57
LED Meter..................................................................................................57
Display.......................................................................................................57
Value/Enter................................................................................................58
Program.....................................................................................................59
Store.........................................................................................................60
Compare....................................................................................................60
Bypass.......................................................................................................60
< Block >....................................................................................................60
< Page >....................................................................................................61
Type..........................................................................................................61
Parameter ..................................................................................................61
Routing......................................................................................................61
Mix.............................................................................................................62
Global ........................................................................................................62
Name.........................................................................................................64
MIDI ...........................................................................................................64
Modulation.................................................................................................66
Power........................................................................................................67
Rear Panel.............................................................................................................67
Power........................................................................................................67
MIDI In........................................................................................................67
MIDI Thru/Out.............................................................................................67
Bypass.........................- Bypass Footswitch...............................................67
Advance......................- Program Advance Footswitch ...............................67
48kHz in.......................- Sample Clock Input ..............................................67
Digital In .......................- Digital Audio In.....................................................68
Digital Out....................- Digital Audio Out..................................................68
Left/Right In.................- Analog Audio In ...................................................68
Left/Right Out..............- Analog Audio Out ................................................68
Effect Parameters...................................................................................................69
Equalization...............................................................................................69
Pitch..........................................................................................................70
Delay .........................................................................................................71
Reverberation............................................................................................72
6: Advanced Applications............................................................................................75
MIDI Functions........................................................................................................75
Global MIDI Channel....................................................................................75
Receiving Program Changes.......................................................................75
Program Change Table...............................................................................76
SysEx Storage...........................................................................................77
MIDI Thru....................................................................................................78
Realtime Modulation Functions................................................................................78
Selecting the Modulator..............................................................................79
Choosing a Target......................................................................................79
Choosing a Source.....................................................................................81
Setting the Amplitude.................................................................................82
Local Generators........................................................................................82
Footswitch Controls................................................................................................85
Program Advance.......................................................................................85
Bypassing Effects.......................................................................................86
Controlling Delay Time via Tap Tempo..........................................................86
7: Alesis Optical Interface............................................................................................87
Overview................................................................................................................87
Digital Clock Synchronization...................................................................................87
Connections..........................................................................................................88

Contents
6 QuadraVerb 2 Reference Manual
To a Single ADAT.......................................................................................88
To Two or More ADATs ...............................................................................89
To the AI-1.................................................................................................91
From the QuadraSynth................................................................................91
Routings................................................................................................................92
To specific ADAT tracks...............................................................................92
From ADAT through the QuadraVerb 2 back to ADAT ...................................93
From the QuadraSynth through the QuadraVerb 2 back to ADAT...................94
8: Trouble-Shooting.....................................................................................................95
Trouble-Shooting Index..........................................................................................95
Error Messages......................................................................................................96
Checking the Software Version...............................................................................97
Re-initializing..........................................................................................................97
Total Reset.............................................................................................................97
Maintenance/Service..............................................................................................97
Cleaning....................................................................................................97
Warranty Information...................................................................................97
Refer All Servicing To Alesis........................................................................97
Obtaining Repair Service.............................................................................98
MIDI Implementation Chart.........................................................................................99
Specifications................................................................................................................100
Effects Processing Index.............................................................................................102

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 7
CHAPTER 1
SETTING UP
Unpacking and Inspection
Your QuadraVerb 2 was packed carefully at the factory, and the shipping carton was
designed to protect the unit during shipping. Please retain this container in the highly
unlikely event that you need to return the QuadraVerb 2 for servicing.
The shipping carton should contain the following items:
• This instruction manual
• Alesis QuadraVerb 2 with the same serial number as shown on shipping carton
• AC Power Supply Adapter
• Alesis warranty card
J
It is important to register your purchase; if you have not already filled out your warranty
card and mailed it back to Alesis, please take the time to do so now.
AC Power Hookup
The QuadraVerb 2 comes with a power adapter suitable for the voltage of the country
it is shipped to (either 110 or 220V, 50 or 60 Hz).
With the QuadraVerb 2 off, plug the small end of the power adapter cord into
QuadraVerb 2’s [POWER] socket and the male (plug) end into a source of AC power.
It’s good practice to not turn the QuadraVerb 2 on until all other cables are hooked up.
J
Alesis cannot be responsible for problems caused by using the QuadraVerb 2 or any
associated equipment with improper AC wiring.
Line Conditioners and Protectors
Although the QuadraVerb 2 is designed to tolerate typical voltage variations, in
today’s world the voltage coming from the AC line may contain spikes or transients
that can possibly stress your gear and, over time, cause a failure. There are three main
ways to protect against this, listed in ascending order of cost and complexity:
• Line spike/surge protectors. Relatively inexpensive, these are designed to
protect against strong surges and spikes, acting somewhat like fuses in that they
need to be replaced if they’ve been hit by an extremely strong spike.
• Line filters. These generally combine spike/surge protection with filters that
remove some line noise (dimmer hash, transients from other appliances, etc.).
• Uninterruptible power supply (UPS). This is the most sophisticated option. A UPS
provides power even if the AC power line fails completely. Intended for computer
applications, a UPS allows you to complete an orderly shutdown of a computer
system in the event of a power outage, and the isolation it provides from the
power line minimizes all forms of interference—spikes, noise, etc.
Audio Connections
The connections between the QuadraVerb 2 and your studio are your music’s lifeline,
so use only high quality cables. These should be low-capacitance shielded cables
with a stranded (not solid) internal conductor and a low-resistance shield. Although

Chapter 1 - Setting Up
8 QuadraVerb 2 Reference Manual
quality cables cost more, they do make a difference. Route cables to the QuadraVerb
2 correctly by observing the following precautions:
• Do not bundle audio cables with AC power cords.
• Avoid running audio cables near sources of electromagnetic interference such as
transformers, monitors, computers, etc.
• Do not place cables where they can be stepped on. Stepping on a cable may not
cause immediate damage, but it can compress the insulation between the center
conductor and shield (degrading performance) or reduce the cable’s reliability.
• Avoid twisting the cable or having it make sharp, right angle turns.
• Never unplug a cable by pulling on the wire itself. Always unplug by firmly
grasping the body of the plug and pulling directly outward.
• Although Alesis does not endorse any specific product, chemicals such as
Tweek and Cramolin, when applied to electrical connectors, are claimed to
improve the electrical contact between connectors.
Typical Applications
The analog audio inputs and outputs are typically used in one of three ways:
• from one or two effect/aux send outputs of a mixer, and out to the effect return
inputs of the mixer; or,
• from a line-level instrument (like a guitar or keyboard with either a mono or stereo
output), and out to an amplifier or mixer input; or,
• from the stereo buss outputs of a mixer to a mix-down tape machine or amplifier.
When used with a mono source, the QuadraVerb is placed between the source and
the mixer/amplifier. Although the source may be mono, both the [LEFT] and [RIGHT]
outputs can be connected to the inputs of a mixer/amplifier if stereo processing
effects are desired. Alternatively, you could use the INSERTS on your mixer to “patch
in” only the left or right channel of the QuadraVerb 2. If using the effect sends of a
mixer, you have the advantage of sending any of the mixer’s input channels to the
QuadraVerb 2’s input(s), and have control over the level of each channel being sent.
There are other combinations of input and outputs possible when you begin using
the Alesis optical digital input and output. See the “Alesis Optical” section later in this
chapter. For more information on interfacing with other digital audio equipment, see
chapter 7.
Interfacing Directly with Instruments
J
When connecting audio cables and/or turning power on and off, make sure that all
devices in your system are turned off and the volume controls are turned down.
The QuadraVerb 2 has two 1/4” balanced inputs and two 1/4” balanced outputs.
These provide three different (analog) audio hookup options:
• Mono. Connect a cable to the [R] INPUT of the QuadraVerb 2 from a mono
source, and another cable from the [R] OUTPUT of the QuadraVerb 2 to an
amplification system or mixer input.

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 9
TM
Instrument or Effect Send
Right
Input
To Amplifier or Mixing Console
Right
Output
•Mono In, Stereo Out. While still using a mono input, you could connect two
cables to the [L] and [R] OUTPUTS of the QuadraVerb 2 to a stereo amplification
system or two mixer inputs.
TM
Instrument or Effect Send
Right
Input
To Amplifier or Mixing Console
Left
Output
Right
Output
•Dual Mono or Stereo Source. The QuadraVerb 2 may be used with two
different instruments simultaneously, or with a stereo instrument. The hookup is
the same; the difference is in the routing used within a program. A program may
process the two inputs discretely, using blocks dedicated to a single channel (for
example, a delay for a guitar and a gated reverb for a bass), or process them in
stereo (for example, with the left and right outputs of a keyboard routed through
two reverb blocks). Connect two cables to the [L] and [R] INPUTS of the
QuadraVerb 2 from two mono sources or from the stereo output of the instrument,
then connect two other cables from the [L] and [R] OUTPUTS of the QuadraVerb 2
to a stereo amplification system or two mixer inputs.
BLOCK
2
7
TM
Right
Input
To Amplifier or Mixing Console
Left
Output
Right
Output
Left Input
Instrument or Effect Send
Note: In most cases when plugging an instrument directly into the QuadraVerb 2 ,
you’ll use Programs which route the "dry" signal at the input(s) directly to the
output(s), where it will be mixed together with the effected signal to achieve the
proper wet/dry mix at the QuadraVerb 2's outputs. If the program doesn't include this
routing, you will only hear the effected signal by itself. Therefore, it may be necessary
to edit such programs to add these "dry" routes when using the QuadraVerb 2
directly with an instrument. (The Factory Preset programs usually include these
routes.)
Interfacing to a Mixing Console
The QuadraVerb 2 handles mono or stereo sends at all system levels. The input
circuitry of the QuadraVerb 2 can easily handle +4 dBu levels (+19 dBu peaks), while
having enough input and output gain to interface with the lower -10 dBV signal levels
of many recording systems.

Chapter 1 - Setting Up
10 QuadraVerb 2 Reference Manual
The QuadraVerb 2 may be connected to a mixing console in several ways. Usually, it
is connected to the auxiliary send and return controls of the mixer. Another method of
interfacing is to connect the unit directly to the insert send and return patch points of
the channel that is to be effected. Still another way of interfacing the QuadraVerb 2 to
a mixer or recording console would be in-line across the output of your mixing
console. This last setup would be used only if you needed to effect the entire mix.
Using the Aux Sends
Generally, mixing consoles provide two types of auxiliary sends: pre-fader sends for
creating a cue (headphone) mix, and individual, post-fader effect sends. Typically, if a
mixer has more than two sends per channel (4, 6 or 8, perhaps), the first two sends
are reserved for the cue sends, while the remaining sends are used to feed effects. If
you are using a mixer with more than two sends, connect the QuadraVerb 2 using
post-fader sends.
Using a mixer’s aux sends poses a distinct advantage: each channel has its own level
control feeding the aux output (and eventually the QuadraVerb 2 input). This allows
you to make a mix of any channels you want to go to the effects by using the
individual channels’ aux send levels on the mixer. Most consoles also have aux
master controls, which set the overall level of each aux output.
Coming back from the QuadraVerb 2’s outputs into the mixer, you have two options:
• connecting to dedicated return inputs, or
• connecting to channel inputs.
The former is good if your mixer provides dedicated inputs (called returns) for effect
devices like the QuadraVerb 2. If your mixer does not have these, or you have already
used them all, consider connecting the QuadraVerb 2 to channel inputs or unused
tape returns.
Setting the Effect/Dry Balance
No matter where you connect the output of the QuadraVerb 2 into the mixer, you are
in control of the balance between the mixer’s channel inputs (the uneffected signal
being routed to the aux sends and the Mix) and the effect returns coming from the
QuadraVerb 2. The effect returns generally should only contain effected signal, and
not have any uneffected signal mixed with it (since these two signals are blended
together at the mixer).
If the Program you are using has the LR IN connected to the LR OUT, you may be
getting some dry, uneffected signal at the return. Generally, this is not desirable,
since the "dry" signal is already being heard through the original channel’s fader.
Therefore, in a mixer application you will want to cut the QuadraVerb 2’s Program’s
path which connects the inputs to the outputs. This can be done in three ways:
• Go to the Mix parameters to bring down the direct level
• Go to the Routing function of each program and remove the patch cords
connecting the inputs to the outputs
• Turn on the Global Direct Signal Mute function. This is the easiest method.

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 11
J
Most Preset Programs route the LR IN signal to the LR OUT.When connecting to a
mixer’s aux sends and returns. the Global Direct Signal Mute should be set to ON.
To remove all direct routings of inputs to outputs on all Programs simultaneously:
¿Press [GLOBAL].
The [GLOBAL] LED will be lit.
¡Press [< PAGE] once.
This selects Global Page 9. The display will read:
GLOBAL DIRECT SIGNAL MUTE:
OFF
¬Turn the [VALUE/ENTER] knob to the right until the display reads “ON.”
The next Program recalled which has the inputs routed to the outputs will not
display the patch cords for these connections nor will you hear any direct
uneffected signal at the outputs.

Chapter 1 - Setting Up
12 QuadraVerb 2 Reference Manual
Mono In - Stereo Out. If you only want to feed the QuadraVerb 2 a mono input,
but wish to connect both of its outputs back to the mixer, you will need three 1/4"
audio cables. Connect a cable from an effect send to the [R] INPUT of the
QuadraVerb 2, another cable from the [L] OUTPUT of the QuadraVerb 2 to an effect
return or other mixer input, and another cable from the [R] OUTPUT of the
QuadraVerb 2 to an adjacent mixer input.
Aux Send 1
Right Input
Right OutputLeft Output
Aux Return or Input Channel
Aux Return or Input Channel
Mixer
Stereo In - Stereo Out. This connection is similar to the one described above.
However, by utilizing two sends from the mixer, we add one more cord and can now
send a stereo signal to the QuadraVerb 2’s inputs. Example, if you connected effect
sends 3 and 4 to the [L] and [R] INPUTS, and had a stereo instrument (such as a
keyboard) connected to two channel inputs of the mixer (either one panned hard left
and hard right), you would send the left channel to send 3 and the right channel to
send 4. Alternatively, you could have two discrete effect sends between the Left and
Right channel, and process each separately within the QuadraVerb 2. For example,
the Left channel (from send 3) could be a chorus, and the Right (from send 4) could be
a reverb. This is similar to Dual Mono, described earlier.
Aux Send 3
Right Input
Right OutputLeft Output
Aux Return or Input Channel
Aux Return or Input Channel
Aux Send 4
Left Input
Mixer
Using Inserts
By using individual channel inserts, you can dedicate the QuadraVerb 2 to a specific
channel (or pair of channels) on the mixer. The Insert connections on the back of the
mixer provide a way of “inserting” external processing equipment into the signal path.
The insert occurs after the input amplifier, and before the main fader; essentially it is
the same as connecting the source (instrument or microphone) into the QuadraVerb
2 before the mixer’s channel input. However, some mixing console’s inserts come
after the EQ section, and may therefore be different from the original signal.

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 13
Usually, insert connections require a special, stereo-splitting Y-cord to be connected
(one stereo plug provides both send and return while two mono plugs connect
separately to an input and output). These are known as TRS connectors (tip-ring-
sleeve). The tip of the stereo plug typically carries the send or output of the insert
jack, while the ring carries back the return. The sleeve represents a common ground
for both signals. Check the manual of your mixer because some are wired differently
(for example, having two separate jacks for send and receive).
Mono. This involves connecting a 1/4" TRS (tip-ring-sleeve) to the Insert jack of a
single channel on a mixing console. The other end of the cable (which splits into two,
1/4" mono connectors) are connected to the [R] INPUT and [R] OUTPUT,
respectively. If you do not hear any audio after making these connections, swap the
input and output cables at the QuadraVerb 2, as these may be wired backwards. If the
cable is color-coded, usually the red jack represents the send (which connects to the
QuadraVerb 2’s INPUT) and black is the return (which connects to the OUTPUT).
3
MIXER
Insert
Right Input Right Output

Chapter 1 - Setting Up
14 QuadraVerb 2 Reference Manual
Stereo. In the case where a stereo instrument, such as a keyboard or sampler, is
connected to two separate channels of a mixing console, you will need two 1/4" TRS
cables, one for each channel. The connection is made in a similar fashion as
described above.
MIXER
Left
Master
Insert
Right Input Right Output
Left Input Left Output
Right
Master
Insert
Using Main Outputs
When you want to effect everything on the mixer, you can connect the QuadraVerb 2
between the mixer’s outputs and the amplifier’s or tape machine’s inputs. This is done
by using two 1/4" cables to connect the Left and Right Main Outputs of the mixing
console to the [L] and [R] INPUTs of the QuadraVerb 2. The [L] and [R] OUTPUTs of
the QuadraVerb 2 are then connected to a stereo amplifier, or two input channels of
another mixing console (for sub-mixing applications).
Left
Master
Out
Right Input
Right OutputLeft Output
Left Input
Mixer Stereo Amp
Left Input Right Input
Right
Master
Out
If your mixer’s outputs use XLR balanced connectors, use the illustration below as a
guide for wiring cables to connect to the QuadraVerb 2’s inputs.

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 15
12
3
Tip
Ring
Sleeve
Avoiding Ground Loops
In today’s studio, where it seems every piece of equipment has its own computer chip
inside, there are many opportunities for ground loop problems to occur. These show
up as hums, buzzes or sometimes radio reception, and can occur if a piece of
equipment “sees” two or more different paths to ground. While there are methods to
virtually eliminate ground loops and stray radio frequency interference, most of the
professional methods are expensive and involve installing a separate power source
just for the sound system. Here are some easy helpful hints that a professional studio
installer might use to keep those stray hums and buzzes to a minimum.
¿KEEP ALL ELECTRONICS OF THE SOUND SYSTEM ON THE SAME AC
ELECTRICAL CIRCUIT. Most stray hums and buzzes happen as a result of
different parts of the sound system being plugged into outlets of different AC
circuits. If any noise generating devices such as air conditioners, refrigerators,
neon lights, etc., are already plugged into one of these circuits, you then have a
perfect condition for stray buzzes. Since most electronic devices of a sound
system don’t require a lot of current (except power amplifiers), it’s usually safe to
run a multi-outlet box (or two) from a SINGLE wall outlet, and plug in all of the
components of your system there.
¡KEEP AUDIO WIRING AS FAR AWAY FROM AC WIRING AS POSSIBLE. Many
hums come from audio cabling being too near AC wiring. If a hum occurs, try
moving the audio wiring around to see if the hum ceases or diminishes. If it’s not
possible to separate the audio and AC wiring in some instances, make sure that
the audio wires don’t run parallel to any AC wire (they should only cross at right
angles, if possible).
¬TO ELIMINATE HUM IF THE ABOVE HAS FAILED:
A) Disconnect the power from all outboard devices and tape machines except
for the mixer and control room monitor power amp.
B) Plug in each tape machine and outboard effects device one at a time. If
possible, flip the polarity of the plug of each device (turn it around in the
socket) until the quietest position is found.
C) Make sure that all of the audio cables are in good working order. Cables with a
detached ground wire will cause a very loud hum!!
D) Keep all cables as short as possible, especially in unbalanced circuits.
If the basic experiments don’t uncover the source of the problem, consult your dealer
or technician trained in proper studio grounding techniques. In some cases, a “star
grounding” scheme must be used, with the mixer at the center of the star providing
the shield ground on telescoping shields, which do NOT connect to the chassis
ground of other equipment in the system.
MIDI MIDI is an internationally-accepted protocol that allows music-related data to be
conveyed from one device to another. The MIDI connections on the QuadraVerb 2
provide four different functions:

Chapter 1 - Setting Up
16 QuadraVerb 2 Reference Manual
• To recall programs using MIDI program change messages
• To control various parameters inside the QuadraVerb 2 in realtime via MIDI
controllers ( example: A keyboard’s mod wheel, or pedals, etc.)
• To send and receive SysEx (System Exclusive) dumps of individual programs or
the entire bank of programs for storage and retrieval purposes
• To pass-on MIDI information thru the QuadraVerb 2 to another MIDI device.
To connect the QuadraVerb 2’s MIDI ports to another MIDI device:
¿Connect a MIDI cable from the QuadraVerb 2’s MIDI [THRU/OUT] connector to the
MIDI IN connector of the other MIDI device.
¡Connect another MIDI cable from the QuadraVerb 2’s MIDI [IN] connector to the
other MIDI device’s MIDI OUT connector.
For more information about MIDI, refer to chapter 6.
Alesis Optical
The Alesis Optical interface provides two EIAJ fiber optic connectors for [DIG IN] and
[DIG OUT]. These connectors use a proprietary Alesis multichannel format first
introduced with the ADAT Multitrack Recorder. The QuadraVerb 2 can send and/or
receive digital audio directly to/from an ADAT (or other devices which use the same
optical interface). Digital connections provide better fidelity than the analog inputs
and outputs.
The proprietary Alesis Optical format carries up to 8 audio channels on a single fiber
optic cable. Since the QuadraVerb 2 has two channels (left and right), you may
choose two of the incoming 8 channels for the QuadraVerb 2 to process. The
QuadraVerb 2’s Left and Right Outputs can then be routed in the digital format using
any two channels (they don’t have to be the same as the input channels). Fiber optic
cables of various lengths are available from your Alesis dealer. The shorter the cable,
the better. The OC cable is 5 meters long (16'4") and is the maximum length
recommended.
Footswitches
On the rear panel you will find two footswitch jacks labeled [ADVANCE] and
[BYPASS]. Any momentary single-pole/single-throw footswitch, normally open or
normally closed, will work for the two footswitch functions. These should be plugged
in prior to power-up so that the QuadraVerb 2 can configure itself for the type of
footswitch being used.
Advance
The [ADVANCE] jack lets you scroll through the Programs in memory by advancing to
the next higher numbered Program each time the connected footswitch is pressed.
The QuadraVerb 2 will “wrap-around” whenever it reaches the end of available
Programs and the Advance footswitch is pressed again. You can set a range of
Programs to be used, thereby cutting off other Programs from being recalled in this
manner. For example, if you set the range to be User 10 through User 24, only
Programs within this range will be recalled using the Advance footswitch. If Program
24 is selected and the footswitch is pressed again, Program 10 is recalled.

Setting Up - Chapter 1
QuadraVerb 2 Reference Manual 17
To adjust the Advance Footswitch’s set of Programs:
¿Press [GLOBAL].
The [GLOBAL] LED will light.
¡Press [PAGE >] once.
This selects page 2, and the display will read:
FOOTSWITCH: 00 Pset TO 00 Pset
¬Turn the [VALUE/ENTER] knob to adjust the Program number to begin the range
(Preset 00 — 99, User 00 — 99).
÷Press [PAGE >] once and use the [VALUE/ENTER] knob to adjust the Program
number to end the range (Preset 00 — 99, User 00 — 99).
Bypass
The Bypass footswitch jack lets you turn the Bypass function on and off from a
connected footswitch. When pressed, the [BYPASS] LED will light, indicating that
Bypass mode is enabled. When pressed again, the [BYPASS] LED will turn off.
For more information about Bypass mode, see chapters 2 and 5.
Tap Tempo
Either footswitch jack can be used to provide a tap tempo source for setting delay
time, provided the selected Program uses one of the two available tap tempo delay
types. This requires that you have defined an Effect Block as one of the two Tap
Tempo delay types, and that the desired footswitch jack has been selected for
controlling tap tempo. To select a footswitch jack for use with a Tap Tempo Delay:
¿Press [GLOBAL].
The [GLOBAL] LED will light.
¡Press [< PAGE] twice to select Global Page 8.
The display will read:
TAP TEMPO FOOTSWITCH: NONE
¬Turn the [VALUE/ENTER] knob to select either the ADVANCE or BYPASS
footswitch jack, depending on which one you wish to use to control tap tempo.

18 QuadraVerb 2 Reference Manual

Your First Session With The QuadraVerb 2 - Chapter 2
QuadraVerb 2 Reference Manual 19
CHAPTER 2
YOUR FIRST SESSION WITH THE
QUADRAVERB 2
Powering Up
After making your connections, turn on the system’s power using this procedure:
¿Before turning on the QuadraVerb 2’s power, check the following items:
• Have all connections been made correctly?
• Are the volume controls of the amplifier or mixer turned down?
¡Turn on the [POWER] switch on the front panel of the QuadraVerb 2.
Upon power-up, the QuadraVerb 2 will display the last selected Program, and the
[PROGRAM] button’s LED will be lit. If this Program has been edited, the display
will indicate this by showing the word “EDITED”, and by flashing the Program
Number and Name in the upper display.
¬Turn on the power of the amplifier/mixer, and adjust the volume.
Setting Levels
Proper setting of the [INPUT LEVEL] and [OUTPUT] knobs is crucial in order to
achieve the maximum signal-to-noise ratio (the concentric knobs allow the Left and
Right Input levels to be adjusted separately). As a good starting point, set both input
and output level controls at about 2 o'clock or 65% of full. This will decrease the
possibility of overload distortion and keep the amount of background noise to a
minimum.
J
For quietest operation, you should adjust the level of the source being sent to the
QuadraVerb 2 so that the green [-3dB] LEDs in the QuadraVerb 2’s peak meter flash,
but not so loud that the red [CLIP] LEDs turn on. A nominal input sound make the
-12dB LED turn on