Vintage Revolution Acoustic Box II User manual

Acoustic box II
Owner’s Manual Ver 2.1

2
We would like to thank Acoustic Box users around the world for the tips and
advice in the preparation of this handbook. The close contact with many
skilled musicians at the labs of VR and by correspondance has been most
inspiring and beneficial in the development of our new Acoustic Box II.
Enjoy your purchase and our hard work.
M. De Iulis & M. Cholevas

3
Table of content
INTRODUCTION
Summary of Features p4
Important Safety Instructions p5
Before Getting Started p6
ACOUSTIC BOX II IN DETAIL
Channel 1 and Auxiliary input p7
Channel 2 p8
Compressor - EQ - Tuner - Mute - Output p9
Phantom Power - Metronome - Effects p10
ACOUSTIC BOX II IN PRACTICE
Levels - Outputs - Sources p11
Using microphone and Piezo p11
Using AKG C411 and piezo p11
Using only piezo p12
Handling acoustic feedback tips p12
On stage In-ear Monitoring and Backtrack rehearsal p12
TECHNICAL SPECIFICATIONS p13
ABOX II Top and Side views p15
Signal Flow Diagram p16

4
SUMMARY OF FEATURES
• Independent parametric equalizer per channel
• Parametric 3 bands EQ for Mix
• Notch Filter
• Parametric HPF
• Independent volume controls for stereo PA/Headphones and Amp out
• True 48V phantom power
• Master mute & Tuner
• Integrated Optical Compressor
• Digital Effects (Stereo Reverb and Delay pre-installed including Tap De-
lay)
• Foot switch input for turning on/off internal or external effects
• Effect send and return loop (stereo)
• Auxiliary input and output (can be used for backtrack rehearsal, setup
offstage with a pair of headphones and as a loop for in-ear monitoring)
• Metronome/ Tap Tempo
• Custom designed Linear Power supply US-EU selectable 110/240V) with
aerospace connector
• Neutrik audio connectors
• Robust design and Construction
Summary of Features

5
This product has been designed and manufactured to meet strict safety and qual-
ity standards. It is very important that you are aware of the following installation and
operation precautions:
1. Read and keep these instructions and heed all warnings
You should read all the safety and operating instructions carefully before operat-
ing this apparatus. Retain this manual for future reference and adhere to all warn-
ings in the manual or on the apparatus.
2. Water and moisture
The presence of electricity near water can be dangerous. Do not use the appara-
tus near water – for example next to a bathtub, a sink, in a wet basement or near
a swimming pool, etc.
3. Object or liquid entry
Take care that objects do not fall and liquids are not spilled into the enclosure
through any openings. Liquid filled objects such as vases should not be placed on
the apparatus.
4. Cleaning
Unplug the unit from the mains supply before cleaning. The case should normally
only require a wipe with a soft, damp, lint-free cloth. DO NOT use paint thinners or
other chemical solvents for cleaning, which will destroy prints and paintwork. DO
NOT use alcohol or household cleaning products. DO NOT USE WATER.
5. Power sources
Only connect the apparatus to a power supply of the type described in the
operating instructions or as marked on the apparatus, and install the unit near the
power outlet (socket). Appliance coupler is considered as disconnect device. It
shall remain readily operable..
6. Power-cord protection
Power supply cords should be routed so that they are not likely to be walked on,
bent, stretched or pinched by items placed upon or against them, paying particu-
lar attention to cords, plugs, convenience receptacles and the point where they
exit from the apparatus.
7. Abnormal smell
If an abnormal smell or smoke is detected from the apparatus, turn the power off
immediately and unplug the unit from the wall outlet. Contact your dealer im-
mediately.
8. Servicing and maintenance
None of the parts inside the enclosure of this apparatus is serviceable by the user.
DO NOT open the enclosure and DO NOT attempt to modify the internal circuitry.
All servicing and maintenance beyond what described in this manual should be
referred to qualified service personnel.
9. Damage requiring service
The apparatus should be serviced by qualified service personnel when:
• Objects have fallen onto, or liquid has been spilled into the apparatus, or
• The apparatus has been exposed to rain, or
• The apparatus does not appear to operate normally or shows a marked
change in performance, or
• The apparatus has been dropped and/or the enclosure damaged.
The lightning flash symbol within an equilateral triangle is intended to alert the
user to the presence of uninsulated ‘dangerous voltage’ within the product’s
enclosure that may be of sufficient magnitude to constitute a risk of electric
shock to persons.
CAUTION: To reduce the risk of electric shock, do not remove cover or back. No user
serviceable parts inside. Refer servicing to qualified service personnel.
WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to
rain or moisture.
The exclamation point within an equilateral triangle is intended to alert the
user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the product.
To reduce the risk of fire or electric shock, unplug the apparatus when there
is high probability of lightning.
IMPORTANT SAFETY INSTRUCTIONS

6
Working with Presets
6
Before Getting Started
BOX CONTENT
The following items should be included in your Acoustic Box live package:
• The Acoustic Box II preamp
• Power supply
SHIPPING, STORING AND TRANSPORTING
Great care was taken in the manufacturing and packaging of your Acoustic
Box II preamp. Everything should be included and in perfect working order.
Damaged units should never be sent directly to us. Please inform the dealer
from whom you acquired your Acoustic Box II of the damage, as well as the
transportation company that delivered it to you. You must follow the steps
above in order to retain the validity of your warranty. Please register your
product via our web site here.
GETTING STARTED
Before connecting the power supply to the power socket, make sure that
the proper voltage is selected according to the mains of your country.
For US use 125V, for Europe 230V.
Before turning the power supply via the main switch, make sure that all
the cables are firmly connected to the preamp. Including headphone
cable, XLRs and JACK cables. To preserve the long term performances
of the preamp avoid detaching/connecting any of the cables while the
Acoustic Box is powered on.
Before powering on the preamp make sure that the output knobs are not set
to maximum. Keep in mind that XLR output knobs control the headphone vol-
ume as well. A good starting point for the output knobs is in the middle at 12
o’clock. Turn on the Abox using the power switch on the power supply and
mute the output using the mute button on the Abox.
Power supply:: Select the AC voltage corresponding to your local AC power
(125V-230).
Verify using the light monitors that the pickup/mic are producing a signal in the
channels. Disengage the mute button.
Ensure that the phantom voltage is correctly set via pref. menu. Condenser
mics need phantom power. If you are using dynamic and ribbon mics turn off
your phantom power.
Adjust impedance of your pickup. Try both setting and see which one is better
for your pickup. Passive piezo prefer High impedance setting. Active piezo and
magnetic coil prefer Med impedance.
Connect/disconnect your power connector to the Acoustic box II al-
ways when the power switch is OFF.
If you need to plug in to your headphone connector while the unit is on,
press the mute button before inserting the mini-jack in to the headphone
connector.

7
Channel 1 (Ch1) and Aux Input
Ch1 has a selectable medium/high input impedance . It is designed for pas-
sive transducers (eg. piezo or magnetic pickup) and it can handle up to 0 dBu
without distortion. Use a mono jack from the left side in proximity of the Ch1 to
connect to your pickup.If you are properly connected, your signal strenght will
be monitored via the Ch1 LED.
Level control and +10dB gain button.
The LEVEL knob controls the output signal of the Ch1. If you are tuning the
Ch1’s equalizer or if you do not intend to use Ch2 keep the LEVEL of Ch2 to
minimum. Ch1 offers +10dB gain boost to be used if the input signal is low.
Parametric high-pass filter (HPF )
Ch1 is equipped with a 2nd order high-pass filter with cut off frequency tun-
able from 40 to 150Hz. For double bass, the high-pass filter remove the subhar-
monic “thump” generated by the plucked bass, which otherwise can drive
ported bass speakers to over-excursion.
Parametric equalizer (EQ1)
Ch1 is equipped with a parametric equalizer designed to control the mids of
your passive pickup. It operates between 350Hz to 4KHz with correction of +/-
12dB.If you use a piezo transducer, by attenuating at least 6dB the frequency
around 1 o’clock you will be able to obtain a much more natural sound.
Impedance selector
Next to the Ch1 1/4” input you will find a Med (1Meg)/High impedance
(8.2 Meg) selector which will match the impedance of your pickup.
Aux input
Acoustic Box II is equiped with an independent Aux Input. You can use it
to connect an external source such as a metronome/ipad/phone/looper
e.t.c. for playback, practice or performance purposes. In conjunction with the
Aux stereo Headphones output it can be used for linear on stage monitoring.
Channel 1

8
Channel 2 (Ch2)
Ch2 has a hybrid XLR -1/4” input connector. It is designed to connect either
active or passive microphones via an XLR balanced cable or a mono jack
cable. The +48V phantom can be activated/deactivated by the Pref. button
on the low left corner of the LCD. If you are properly connected, your signal
strenght will be monitored via the Ch2 green LED. If you intend to use the XLR
keep the switch on Mic otherwise select the switch to Line and insert a Jack
on Ch2. XLR input can be adjusted with +10dB gain selector. This gain
selector will not affect the Jack Line settings.
Level control (Ch2)
The LEVEL knob controls the output signal of the Ch2. When you are tuning
the Ch2’s equalizer or if you do not intend to use Ch1 keep the LEVEL of Ch1
to minimum.
Notch filter
The programmable NOTCH filter on Ch2 can be activated/deactivated by
using the button placed on top of the notch frequency tuner. If you need to
use the notch filter press the button above the knob and tune the frequency
(50Hz-250Hz).
Parametric equalizer (Ch2)
Ch2 is equipped with a parametric Eq designed to control the low/mids of
your mic. It operates between 350 to 4KHz by correcting within +/-12dB.
High pass filter ( )
Ch2 is equipped with a 2nd order high pass filter with cut off frequency 100Hz.
The intended use is to reduce the proximity effect typical of condenser micro-
phones.
Phase button Ch2 (ø)
The phase button allows for 180° phase shift between Ch2 and Ch1 when the
switch is engaged. Use this Phase button to determine the correct phase
between channel two and one. To do so compare the sound produced by
activating and deactivating the Phase button. The Phase configuration that
produces the more natural sound is the correct setting.
Low pass shelving filter ( )
When the filter is engaged, it attenuates Ch2 of 6dB in the range 1KHz-20KHz.
This low pass filter is very handy for those who need high volume on stage.
Therefore, the advantage of this filter is to reduce, when engaged, the con-
tribution of the unwanted signals coming from the other instruments/noise
present on the stage. By reducing the mic contribution in this frequency range,
the filter allows higher volume with less feedback.
Channel 2

9
Compressor/Mixed channel Ch1+Ch2 EQ
The new Acoustic Box II comes with an optical compressor and a 3 band
parametric eq. The mixed channel is the signal obtained by adding the
processed channels Ch1 + Ch2 after the compression. Each individual
channel contribution is set by the LEVEL control knob (see p.8 and p.9 )
Compressor
The optical Compressor provide up to 16dB compression. It is engaged where
the Comp button is engaged. Otherwise the Compressor is bypassed.
The level of Compression can be set with the SENS knob. If Sensitivity is set to
minimum no compression (0dB) is performed. Once the desired compression
level is set, use the MAKEUP gain knob to adjust the output level. The LED indi-
cator on the compressor turns on when compression of 10 dB is obtained.
Phase ALL button (øAll)
When the ALL button is pressed, it allows for 180° phase shift between
(Ch1+Ch2) and the acoustic signal. This button is handy for controlling the
feedback and for getting a good bass response of the blended signal on your
acoustic sound.
Parametric Equaliser
To equalize the mixed channels the Abox uses a 3 band parametric eq Low-
Mid-High (40Hz - 125Hz, 250Hz - 1KHz, 3.5KHz - 12KHz respectively) by correcting
within +/-12dB designed to help you adapt on any situation of sources and
combination of inputs.
Master mute/Tuner mode
By Pressing the Mute button the preamp mutes all outputs and gets into tuning
mode as indicated on the display. The tuner receives signal measurement only
from Ch1 therefore Ch2 can’t be used for tuning. Play your string and tune
until you see the tuner highlighting the circle in the middle of the display. Once
the string is tuned, hold your strings until the tone on display clears up.
LEVEL AMP
The LEVEL AMP knob allows you to control the output signal level that is
directed into your AMP via the unbalanced Jack (AMP output).
LEVEL XLR L and XLR R
The LEVEL XLR L and XLR R knobs allow you to control the output signal level
connected to your PA/MIXER via XLR balanced cables. Abox II comes with two
XLR knobs since it controls stereo effects (both internal and external).
Those knobs control as well the Headphones output.
ÕÓo ÕÕÕÕÓÓÓÓ
Compressor-EQ-Tuner-Mute-Outputs

10
Phantom 48V on/off
From the main menu press the Pref. button and use the - + buttons to activate
or deactivate the Phantom power for Ch2
Once your Phantom is set, press the Pref. button and the value will be saved.
Every time you will power up the preamp, the phantom voltage will be set ac-
cordignly.
Effects
The internal DSP is offering a different variaty of Reverbs and Delays. A copy of
the analogue preamp out is send to the effect. The send level can be ad-
justed via the Send knob. The effects are blended stereo into the analogue
signal via the Return knob. The effects can be muted and unmuted directly by
pressing the Effect button.
The LED above the Effect button will turn on. Use the - + buttons to choose the
desired Effect. The Effects names among asterisk symbols are programmable.
Press the Edit button to enter the settings pages. the Edit button allows you to
navigate between Settings pages, while the Pref. button allows you to navi-
gate between parameters on the same Settings page. Use the - + buttons to
change the parameters. To maximize signal quality set the Send knob to the 3
o’clock and adjust the Return knob to desired blended level. The Return signal
will add to the dry signal and routed to the corresponding outputs (mono or
stereo).
Metronome and tap tempo
Pressing and holding the Tempo button will set the device on Tempo mode.
You can either set the tempo by tapping the Tempo button or by using the
- + keys. The Tempo LED will blink on the tempo you set allowing to use it as
a visual metronome. Press and hold the Tempo button to return to Effects
mode. When you are using the SingleTap delay effect, tap on Tempo button
to program the Tempo of the delay on the spot. You can also program the
Tempo using the Settings page of the SingleTap.
External Effect loop and foot switch
The Abox II is equipped with an External Effect parallel loop so that you can
add ex-ternal effects in the chain. Once the external jacks are insterted, the
internal DSP is bypassed. You can then use the Send to control the level of
signal that is routed in to the external effect. Use the Return knob to adjust the
effect level. The Abox II has a Foot Switch input which is used to activate and
bypass the internal or external effects. Any momentary switch working with
mono Jack will work fine. Return level operate at professional line level +4dBm
(return knob at 10 o’clock) or instrument line level -10dBm (return knob at the
maximum).
Phantom 48V:OFF
The Acoustic Box comes with 10 Reverb and 4 Delay effects preinstalled, more
will be availabe on the website of www.vintage-revolution.com.
Reverb: Spring, Room, Chapel, Church, Med Hall, Big Hall, Gated, Reverse
Programmable reverb: Plate, Hall
Programmable Delay: SingleTap, TripleDly, 4TapsDly, Twin Delay
006Ó*Hall*
Lvl ÒÒÒÒÒÒÒÒ
Phantom Power - Metronome - Effects
Press the Effect button to engage the Effect mode for Internal and External ef-
fects.

11
Acoustic Box in practice
This section will guide you to do your sound check in a few minutes and obtain
the desired sound result with the preamp.
LEVELS and OUTPUTS
To obtain the best sound quality keep the levels knobs of Ch1 and Ch2 as high
as possible without distortion. Level monitor on the display provides an indica-
tion of the channel mix (Ch1+Ch2) signal strenght. The levels are properly set if
the level monitor display is within the green range as indicated in the picture
below. The empty square char is indicating 0dBm on the maximulm level set
for XLR outputs. If the levels are too low you might want to add +10dB gain
on the channel or both channels. Vice-versa, if you experience distortion
reduce the gain by selecting lower gain (disable +10dB).
Adjust output knobs only after you have a good range of the input levels.
Using microphone and piezo
This section contains some fine tuning tips for those who use condenser mic
(such as DPA 4099, ATM350 , AKGC414, Neumann U87, etc..) or dynamic mic
(SHURE SM57, SM58, etc..) in combination with piezo pickup.
A. Make sure that the Mic/Line switch is set to Mic and enable the 48V (Phan-
tom Power) if needed using the Pref. button. Set the level of Ch2 on
minimum. Increase the LEVEL of Ch1 until you have a good audible volume.
B. Set the EQ1 knob to 3 o’clock and search with the corresponding frequency
knob for the most unpleasant frequency. If you are using a piezo it should be
between 12 and 3 o’clock.
Once you are there, use the EQ1 knob to remove it untill the sound is more
natural. In most of the cases placing the EQ1 knob at 9 o’clock will do the job.
C. Before adding the mic signal, unpress the NOTCH filter, the low pass filter,
the High Pass filter and the Phase buttons on Ch2 .
D. Gently increase the LEVEL of channel 2 until the level of the second chan-
nel is adding the bottom end. Use the Phase button Ch2 to adjust the phase
shift between the two channels if required.
E. If you experience low frequency resonance/feedback turn on the NOTCH
and tune it untill the low frequency resononance/feedback is removed.
F. If you experience feedback use the Low Pass Sheving Filter to gently
attenuate mid and high tones. By reducing 6dB of the frequency spectrum
above 1KHz you will be less prone to feedback.
G. Use the High Pass Filter to remove the booming effect of the micro-
phone due to proximity with your insturment.
H. Adjust your Low - Mid - High from the three band parametric EQ control
of the blended signal to bring the sound to the desired shape.
Using AKG C411 and piezo
A. Increase the LEVEL of Ch1 until you have a good audible volume.
B. Set the upper EQ1 knob to 15 o’clock and search with the corresponding
frequency knob for the most unpleasant frequency. If you are using a piezo it
should be between 12 and 15 o’clock. Once you are there, use the EQ1 knob
to remove it until the sound is more natural. In most cases placing the EQ1
knob at 9 o’clock will do the job.
C. Before adding the AKG C411 signal from Ch2, deactivate the NOTCH and
activate the low pass .
D. Place the EQ2 knob to 100Hz and the corresponding MID knob to 15 o’
clock. Increase the LEVEL untill you have enough low end from the Ch2.
E. Adjust your Low - Mid - High from the three band parametric EQ control of
the blended signal to bring the sound to the desired shape.
Lvl ÒÒÒÒÒÒÒÒ
Weak Good
Levels - Outputs - Sources

12
Using only piezo
A. Increase the LEVEL of Ch1 untill you have a good audible volume.
B. Set the EQ1 knob to 15 o’clock and search with the corresponding frequen-
cy knob for the most unpleasant frequency. If you are using a piezo it should
be between 12 and 15 o’clock. Once you are there, use the EQ1 knob to
remove it untill the sound is more natural. In most cases placing the EQ1 knob
at 9 o’clock will do the job.
C. Keep the Level of Ch2 to minimum since you will not use this channel.
D. Adjust your Low - Mid - High from the three band parametric EQ control of
the blended signal to bring the sound to the desired shape.
Handling acoustic feedback tips.
Audio feedback is a special kind of positive feedback which occurs when a
sound loop exists between your mic and the AMP or PA speaker.
The two major parameters that determine the amount of feedback are:
A. the distance from your cabinet/monitor and
B. the volume of your mic.
There are two main frequencies that are most sensitive to feedback. The first
area is the LOW-LOW MID (100Hz-250Hz) and the second area is the MID area
(400Hz-1.5KHz). For the LOW-LOW MID area the NOTCH filter is a perfect solu-
tion. For the MID area you can use the low pass shelving button ( )and the
EQ2 knob.
By changing the phase of the blended channel (ALL switch) you virtually
move your instrument in to another physical location and therefore you
change the feedback settings.
On stage In-ear Monitoring
You can use your Abox II auxiliary input and headphones output for on stage
in-ear monitoring.
Ask the sound engineer to send a mix to your Auxiliary input and use the Head-
phones out for your own monitoring. The signal on XLR L+R and AMP outputs is
clean (will not include the signal of the Auxiliary input).
Backtrack Rehearsal
You can use your Abox II auxiliary input and headphones for backtrack re-
hearsal. Connect your auxiliary input min jack to your phone/Ipad/Mp3 player
and play our track. Adjust via XLR L+R the level your instrument and enjoy the
practice.
Piezo, Feedback, In-ear

13
Technical specifications
Connections
Input:
• Ch1: JACK passive channel; 1/4” Dia. Standard Mono Jack
• Ch2: XLR balanced phantom power +48V or 1/4” Dia. Standard Mono Jack
• Effect Jack Return Left and Return right; 1/4” Dia. Standard Mono Jack im-
pedance 18KOhm, operating at level -10dBm/+4dBm
Output:
• AMP OUT (Mix of CH1 & CH2): JACK unbalanced connection; maximum 9V
RMS @ 470 Ohms; 1/4” Dia. Standard Mono Jack
• PA (DI) OUT (Mix of CH1 & CH2): XLR LEFT and RIGHT balanced connection;
maximum 9V RMS @100 Ohms
Electrical characteristics:
Ch1 - Channel 1 (passive channel)
• Impedance 1 Meg -8.2 Meg (Selectable) Signal level up to 0 dBu;
• Adjustable Channel 1 level
• Parametric equalizer of Channel 1: Frequency range 360 Hz - 4KHz
• MID level correction: +/- 12dB.
Ch2 - Channel 2 (active channel, +48V Phantom Power)
• Impedance 2K. Signal level up to Ch2 is -20dBu;
• Parametric equalizer of Channel 2: Frequency range 360 Hz - 4KHz
Tone controls (mix of CH1 & CH2)
• Parametric Low: frequency range 40-125Hz, +/–12dB control
• Parametric Mid: frequency range 250Hz-1KHz, +/–12dB control
• Parametric High: frequency range 3.5KHz-12KHz, +/–12dB control
Power supply characterics
• 110V or 230V selectable.
• Consumption less than 12W
•Outputs: +48V,+15V-15V,+5V
Phantom power on XLR Ch2
• True +48V
Size
• 12x22x7 WxLxH cm
Weight
• 1.3 Kg without power supply.
• 1.8 Kg with power supply.
Specs

14
Top Side - Controls
Ch1
1. Signal Led
2. Level control
3. Gain +10dB
4. Parametric HPF 40Hz - 150Hz
5. On-Off button Parametric HPF
6. Parametric EQ 350Hz - 4kHz Frequency selector
7. Parametric EQ +/- 12 dB Correction
Ch2
1. Signal Led
2. Level control
3. 2nd order HPF with cut off frequency 100Hz (proximity effect controler)
4. Notch filter 50Hz - 250Hz Frequency selector
5. Notch filter On - Off button
6. Parametric EQ 350Hz - 4kHz Frequency selector
7. Parametric EQ +/- 12 dB Correction
8. Low pass shelving filter (LPF - 6dB in range 1KHz-20KHz)
9. Phase shift 180° between Ch2 and Ch1
Compressor and EQ
1. Compressor On - Off button
2. Phase all button (180° phase shift between (Ch1+Ch2) and the acoustic signal)
3. Compressor sensitivity
4. Compression level led
5. Makeup - Compression Output level
6. Parametric Low 40Hz - 125Hz
7. Parametric Low +/- 12 dB Correction
8. Parametric Mid 250Hz - 1KHz
9. Parametric Mid +/- 12 dB Correction
10. Parametric High 3.5KHz - 12KHz
11. Parametric High +/- 12 dB Correction
Effect - Metronome - Display
1. Metronome and Tap delay mode (led and button)
2. Preferences
3. Value decrease (-)
4. Value increase (+)
5. Edit
6. Effect mode (led and button)
7. Effect Return
8. Effect Send
Left Side - Inputs
Auxiliary Input (for ipod, phone, ipad, looper e.t.c.)
Jack 1/4 input
Jack Mid-High Impedance selector
XLR - Jack Combo input
Mic - Line switch
+10dB switch
Back Side - External effects, Effect Control, USB
USB (for firmware updates and extra effects installation)
External Effect
Send
Return Left
Return Right (for stereo external effects)
Foot On - Off Switch (both for internal and external effects)
Controls

15
q
e t u
i
C
i
Ch1
q
w
e
r
t
y
u
Ch2 o
Comp + EQ
q
w
e
r
t
y
uo
a
q
w
e
Output
Effect - Metronome - Display
w r ye r t
qy
w u
i
Top Side - Controls Left Side - Inputs
Back Side - External effects, Effect Switch, USB Right Side - Outputs
ws
Controls

16
Signal Flow Diagram
+10dB
Phase
Level
Level
+Comp Effects
Send
Return
+
Return
XLR R
XLR L
Aux in R
XLR R
+
Headphones R
+
Aux in L
Headphones L
AMP
+
XLR L AMP
Phase
All
Imp switch
1Meg /8Meg
+10dB
350-4KHz40-150Hz
50-250Hz 350-4KHz
40-150Hz 250-1KHz 3K-12KHz
Mic/Line
Switch
Processor tasks:
Tuner, Phantom,
Metronome,
Tempo, Level
+48V
DSP tasks:
Effects

17
My notes