Alesis Midiverb User manual

Instruction Manual
vi't'SiEStS'-iiR Bm
:
m
mm
&:.4"t
tSS J& "IJS-feS^-SS^-^|^f
s^*-iici'»5^raa»i^*t^**t"V"^1
KsiS|Sip

MIDIVERB
Instruction Manual
INSTALLATION; REAR VIEW
The Midiverb connects easily between any line-level sig-
nal source and any line-level destination such as aPA
mixeror recording console.Mixi ng dry and reverb signals
is accompi ished by use ofthe mix control at the rear of the
unit.The dry signal routed through the mix control is main-
lai ned instereo. If astereo resuIt is desired and the source
is mono, route the monosignal to both inputs. Asimple
Ycord will accomplish this and allow the dry signal to
appear in both channels equally with the reverb in stereo.
this is aparticularly simple setup when adding
ambience to adrum machine without requiring console
sends and receives. The only requirement here is that the
signal source have an output level control so that proper
drivi ng levels can beset.
When connecting to the sends and receives of acon-
sole, rotate the mix control to full reverb (counter-clock-
wise from rear); the deepest returns will be available for
mixing at the board.
The spread of the Midiverb's output stereo image is
wide. While effective in opening up a clear mono space in
amix,the spread can easily be narrowed by the use of the
mixer's reverb return pan pots.
LEVELS'.
To minimize noise and distortion in any application, the
signal driving the Midiverb should be adjusted so that the
green LED is on frequently, with the red LED briefly flash-
ing on transients only. Avoid 'f illing up' the reverb with con-
tinuous program at long (>1sec.)decay ti mes.This wil I
often lead to overloading of the internal math processor
with subsequent distortion.
Many sources such as electric guitars and acoustic
instrumentpickups have insufficientoutput level to ade-
quately drive the Midiverb. In such cases asimple pre-
ampmaybe required. Where possible, alimiting preamp
will level the abrupt transients characteristic of these
instruments, providing control over transient distortion.
OPERATION:
The Midiverb contains 63 preset, user selectable pro-
grams. Programs may be selected by the buttons on the
front panel, stepping through the program list, or by MIDI
patch changedata from any MIDI controlling device.
Defeating the unit and turning off its reverb output is
accomplished by pressing the DEFEAT button once.
Pressing this button again will resume reverb operation.
From MIDI, any patch change number Irom 64 to 128 will
also force the Midiverb into defeat mode.
The MIDI channel the Midiverb will respond to is set by
pressing the MIDICHAN button and simultaneously
stepping the numberup or down by the UP/DOWN but-
tons. When displaying the MIDI channel number, the
display will showalighted segment in the upper left corner
of the display.
THEPROGRAMS:
Programs 1to 50 are reverb algorithms designed to cover
awide range of applications. Programs 51 to 63 are for
special effects.The reverb programs are defined by
decay time, size, and spectral emphasis, respectively.
Large programs tend to have someassociated predelay,
typical of large spaces. Small programs tend to be more
immediate,butcan sound hard or ri ngyat unnatu ral ly long
decay times.
Bright programs carry treble throughout the length of
the decay, while warm programs attenuate the treble as
the decay proceeds. Dark programs roll the treble off
quickly, leaving only deep bass at the end of thedecay.
INSIDE THE MIDIVERB:
At the heart ofthe Midiverb is avery high speed computer
capable of 3,000,000 memoryaccesses/operations per

second, afigure higher than most digital reverbs on the
market today. Classic signal processing computer archi-
tectures with this kind of power are very expensive. The
Mid iverb utilizes anew ki nd of computerarchitectu re
called RISC. Standing for Reduced Instruction Set Com-
puter, RISC architectu re allows an extremely simple, high
speed computer to accomplish remarkably complex
tasks. The Midiverb is not just another digital reverb; it is a
newapproach to digital signal processing technology.
FCCNOTICE:
This equipment generates and uses radio frequency
energy and if not installed and used properly, that is, in
strict accordance with the manufacturer's instructions,
maycause interference to radio and television reception.
It has been type tested andfound to comply with the limits
for aClass Bcomputing device in accordance with the
specificalionsinSubpartJof Part 15of FCC Rules, which
are designed to provide reasonable protection against
such interference in aresidential installation. However,
there is no guarantooe that interference wi11not occur in a
particular installation. If this equipment does cause
interference to radio or television reception, which can be
determined by tu rn ing the equipment off and on. the user
is encouraged to try to correct the interference by one or
more of the following measures:
—Reorient the receiving antenna.
-Relocate (he product with respect to the receiver
-Movethe product away from the receiver
-PI ug the product into a different outlet so that product
and receiver are on different branch circuits.
If necessary, the user should consult the dealer or an
experienced radio/television technician for additional
suggestions. The user may find the following booklet
prepared by the Federal Communications Commission
helpful: "Howto Identify and Resolve Radio-TV
Interference Problems."
This booklet is available Irom the:
U. S. Government Printing Office
Washington, D. C. 20402
{Stock Number 004-000-00345-4)

WMTHE PROGRAMsmm^^^^^^m^^m
1.2 Sec. SMALL BRIGHT 22 1.6 Sec. SMALL DARK 43 5Sec. LARGE WARM
2.2 Sec. SMALL WARM 23 1.6 Sec. LARGE BRIGHT 44 8Sec. LARGE BRIGHT
3.2 Sec. MEDIUM BRIGHT 24 1.6 Sec. MEDIUM BRIGHT 45 8Sec. LARGE WARM
4.3 Sec. SMALL BRIGHT 25 1.8 Sec. LARGE DARK 46 10 Sec. LARGE BRIGHT
5.3 Sec. SMALL WARM 26 1.8 Sec. LARGE BRIGHT 47 10 Sec. LARGE WARM
6.4 Sec MEDIUM BRIGHT 27 1.8 Sec. MEDIUM WARM 48 16 Sec LARGE DARK
7.4 Sec. MEDIUM WARM 28 2.0 Sec. LARGE BRIGHT 49 18 Sec. EX. LARGE BRIGHT
8.6 Sec. SMALL BRIGHT 29 2.0 Sec. MEDIUM WARM 50 20 Sec. EX. LARGE DARK
9.6 Sec. MEDIUM WARM 30 2.0 Sec. LARGE WARM 51 GATED- 100 MS
10 .6 Sec. MEDIUM DARK 31 2.5 Sec. MEDIUM WARM 52 GATED -150 MS
11 .8 Sec. SMALL BRIGHT 32 2.5 Sec. LARGE BRIGHT 53 GATED -200 MS
12 .8 Sec. LARGE WARM 33 2.5 Sec. MEDIUM DARK 54 GATED -250 MS
13 1.0 Sec. SMALL WARM 34 2.8 Sec. SMALL BRIGHT 55 GATED -300 MS
14 1.0 Sec. MEDIUM WARM 35 2.8 Sec. MEDIUM BRIGHT 56 GATED -350 MS
15 1.0 Sec. LARGE BRIGHT 36 3.0 Sec. LARGE BRIGHT 57 GATED -400 MS
16 1.2 Sec. MEDIUM WARM 37 3.0 Sec. LARGE WARM 58 GATED -500 MS
17 1.2 Sec. SMALL WARM 38 3.0 Sec. MEDIUM DARK 59 GATED -600 MS
18 1 .2 Sec. SMALL BRIGHT 39 3.5 Sec. LARGE BRIGHT 60 REVERSE -300 MS
19 1.4 Sec. LARGE WARM 40 3.5 Sec. MEDIUM WARM 61 REVERSE -400 MS
20 1.4 Sec LARGE DARK 41 4.0 Sec. LARGE DARK 62 REVERSE -500 MS
21 1.4 Sec. MEDIUM WARM 42 4.0 Sec. MEDIUM BRIGHT 63 REVERSE -600 MS

LIMITEDWARRANTY:
ALESIS warrants this product to be free of defects in
material and workmanship under normal use for a
period of 90 days. The term of this warranty begins on
the date of sale to the purchaser. Units returned for war-
ranty repairto ALESIS or an authorized ALESISwarranty
repair station will be repaired or replaced at
manufacturer's option, free of charge. This warranty is
void if factory determines defect to be the result of
abuse, neglect, alteration or attempted repair by unau-
thorized personnel. ALESIS assumes no responsibility
for loss or damage, direct or consequential, that may
result from this product failing to perform at any time. All
units returned to ALESIS oran authorized ALESIS repair
facility must be prepaid, insured, and properly pack-
aged. ALESIS reserves the right to update any unit
returned for repair. ALESIS reserves the tight to change
or improve design at any time without prior notice.
SPECIFICATIONS:
FREQUENCY RESPONSE 30 HZTO10KHZ±2dB
DYNAMIC RANGE 75 dB (TYR REVERB PGMS)
PROGRAMS 63 FIXED PROGRAMS
INPUT LEVEL +6dBVPEAK, 1INPUT DRIVEN
dBVPEAK, BOTH DRIVEN
OUTPUTLEVEL +6dBVPEAK
INPUT IMPEDANCE 50 KOHMS
OUTPUT IMPEDANCE 600 OHMS
AUDIOCONNECTORS RCAPHONOJACKS
POWER REQUIREMENTS 16V CENTERTAPPED
TRANSFORMER, 800 mA.
MIDI CONNECTIONS IN&THRU
ALESIS CORPORATION
P.O. BOX 3908* LOS ANGELES, CA 90078
PRINTED IN U.S.A.