OPFXS V-Zero, User Manual

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V-Zero
Monophonic Guitar Synthesizer
www.opfxs.com
User Manual
V-ZERO is a monophonic guitar synth based upon principles of subtractive synthesis. When a note is played the pedal
senses the pitch of the note and drives the on board oscillators. The generated signals can be mixed and processed in
various way by filtering and applying modulations.
Detailed description of every control
Oscillators:

OSC1 Waveform (4P rotary switch): Sine, Saw, Square, Triangle

OSC2 Waveform (4P rotary switch): Sine, Saw, PWM, Triangle

OSC1 Octave (6P rotary switch): 6 octaves range

OSC2 Octave (6P rotary switch): 6 octaves range

OSC 1-2 mix (pot): mixes OSC1 and OSC2

OSC 1 tune (pot): fine tunes OSC1 pitch
Mix and output:

Mix (pot) : mixes dry guitar signal with synthesizer signal

Volume (pot): output level

Output jack: a standard TS jack plug can be used or TRS for splitting the output. TIP of the jack carries synth +
dry guitar signal, RING carries dry signal. TIP signal is affected by MIX and VOLUME controls and can be
bypassed while RING signal is not affected by MIX or VOLUME and can't be bypassed. Split function permits to
drive two different amplifiers or routing the signal to different external devices.
Modulation:

LFO rate (pot): speed of the LFO

LFO depth (pot): depth of the LFO

VCA mod (tactile switch with blinking LED):
o
short press: LFO modulates VCA
o
long press: instrument envelope modulates VCA

LPF mod (tactile switch with blinking LED) :
o
short press: LFO modulates LPF
o
long press: instrument envelope modulates LPF
o
pressing CONTROL and LPF MOD together turns on or off “LPF frequency modulation from OSC2”

Pitch mod (tactile switch with blinking LED):
o
short press: LFO modulates pitch of both OSC1 and OSC2 (Control LED = green)
o
long press: applies pitch portamento, portamento time can be set with LFO rate pot
o
pressing CONTROL and PITCH MOD together turns on or off LOW TRACKING FUNCTION

LFO Wave (tactile switch with LED) : when off the LFO wave is a sine wave, when on the LFO wave is a square
wave
o
pressing CONTROL and LFO Wave together switches between LFO groups (SINE/SQUARE or
SQUARE/SAW)