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Moog VX-351

CV Output Expander for the Minimoog Voyager (2003) 

moog cv

"The VX-351 is a control voltage and gate output expansion box that provides 19 Control Voltage and 2 Gate outputs generated by the Minimoog Voyager"

 Main Data 


Company: Moog Music
Model: VX351
Keyboard : none
Display Type: none
dates: 2003

Synthesis: none
Oscillators: none
Polyphony: none
Filters: none
LFO: 1 modulator 2 shape
Memory none 
MIDI: no
CV gate: 19 I/O

Unit can be rackmounted: the VX-351 Rack mount kit can be used to mount 2 of the following VX-351, VX-352, or CP-251  It is three rack spaces high, and is designed to fit any standard 19" equipment rack.

The VX351 is connected to the voyager with a sub 25 (yes like old paralel port)

Control Voltage outputs
- Keyboard Pitch
- Keyboard Velocity
- Keyboard Afterpressure
- Touch Surface X
- Touch Surface Y
- Touch Surface A (area)
- Pitch Bend Wheel
- Mod Wheel
- MOD 1 signal (signal at Voyager MOD 1 input)
- MOD 2 signal (signal at Voyager MOD 2 input)
- LFO triangle wave
- LFO square wave
- Mod Wheel Mod Buss output
- Pedal/On Mod Buss output
- Filter Envelope
- Volume envelope
- Sample and Hold Step
- Sample and Hold Smooth
- Noise

Gate outputs: 
- Keyboard Gate
- Touch Surface Gate

DB-25 cable included for connection to your Voyager's accessory port 

Nothing... yet!

Have some sounds or demo  want to share? 

- The description can be read at the end of the Moog Voyager synth

- No service manual

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 In details 


The VX-351 connects to the Voyagers accessory port with a sub25.
It features  21 jacks that are connected to the CV and Gate outputs

The CV sections is organized in 6 sections: Touch, keyboard gate, wheel, pedal bus, envelope and samplehold.

351 also features  two 4-way multiples (buffered) and two attenuators - great for use with modular systems

19x CV I/O

 2x gates

2x attenuators

4x multiples

CV and Gate I/O description


TOUCH This group of outputs is generated from the Voyager keyboard’s Touch Surface Controller.
X is the CV generated by horizonta position of contact, Y by vertical contact, and A is the CV generated by the amount of area covered on the touch surface. Finally GATE is a gate signal generated by contact with the touch surface. 


KBD This group of outputs is generated from the Keyboard.
PITCH: This is the CV determined by the note that is played on the Keyboard.
VEL: This is the CV determined by the relative velocity
PRESS: This is the CV determined pressure
GATE: This is the gate signal generated when a key is depressed. 


WHEELS generated by voyager modulation wheels.
PITCH: This is the CV generated from the Pitch Wheel.
MOD: This is the CV generated from the Mod Wheel.  


 This is the output of the Pedal/On Mod Buss. It is the Pedal/On SOURCE shaped by the
SHAPING signal. The level is determined by the
AMOUNT control and the signal at the  MOD1 Input jack


This group of outputs is the output of the Envelope Generators.
FILTER: This is the CV output of the Filter Envelope Generator.
VOLUME: This is the CV output of the Volume Envelope Generator. 

Sample and Hold

relative to the Sample and Hold Circuit.
STEP: This is the output of the Sample and Hold Circuit.
SMOOTH: laged Smoothed output 

Multiple and attenuators


MULT  two 4-way Mults (aka modular Multiples). A "mult" is used to distribute a single source to multiple destinations.

An example is connecting the Voyager’s LFO to the Volume, Filter and Pan Control Inputs. In  this case, all 3 of those parameters will be controlled simultaneously by the LFO.  

ATTENUATORS are used to reduce the amount of a CV signal. The attenuators have an input jack, an output jack, and a knob. The knob sets the amount of the signal present at the input jack that passes to the output jack. When the knob is set to fully clockwise, the full input signal  passes to the output. When the knob is fully counter clockwise, no signal passes to the output


Our Verdict 

" A good way to add some extra function to the voyager, maybe a bit pricey "





Quality / 



-  expensive 


- CV expansion
-it's a Moog machine

Are you a VX351  fan? how do you use it? You do not agree with our review?  Let us know in the comment field just below 



Audio and Video Demo

Moog VX-351 Moog VX-351
80 out of 100 based on 1 user ratings
200 to 250 from 1 sellers Sellers: