µVCA II

Intellijel 6HP
VCA MIXER UTILITY

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Dual DC-coupled VCA with continuously variable linear-to-exponential response per channel. CV attenuator, bias knob for above-unity gain, cascaded mixing output when OUT A is unpatched.

Patch Ideas · 5

★ Classic envelope + audio VCA
VCO into IN A · envelope into CV A · EXP-LIN A fully clockwise for expo response · BIAS A at zero · punchy plucked note shaping
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: µVCA II, VCO, Envelope, Output. Signals: 2 audio, 1 cv.µVCA IIVCOEnvelopeOutputEXP-LIN A=CW (expo) · BIAS A=0: IN AaudioCV AcvOUT AaudioOutaudioOutcvInaudio11. expo VCA pluckaudiocv
★ Two-source mixer via cascade
VCO 1 into IN A · VCO 2 into IN B · leave OUT A unpatched · take sum at OUT B · BIAS knobs set mix levels · CV inputs act as individual automation for each source
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: µVCA II, VCO 1, VCO 2, LFO, Filter. Signals: 3 audio, 1 cv.µVCA IIVCO 1VCO 2LFOFilterBIAS A noon · BIAS B noon · OUT A unpatched: IN AaudioIN BaudioCV AcvOUT BaudioOutaudioOutaudioOutcvInaudio11. cascaded mix of A+Baudiocv
Dual-envelope AM
VCO into IN A · LFO sine into IN B · envelope on CV A for amplitude shape · slower LFO on CV B modulates the modulator · OUT A out OUT B provides tremolo layer · ring-mod-like amplitude interaction
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 6 connections. Modules: µVCA II, VCO, Audio LFO, Envelope, Slow LFO, Mixer. Signals: 4 audio, 2 cv.µVCA IIVCOAudio LFOEnvelopeSlow LFOMixerEXP-LIN A=LIN · EXP-LIN B=LIN: IN AaudioIN BaudioCV AcvCV BcvOUT AaudioOUT BaudioOutaudioOutaudioOutcvOutcvIn 1audioIn 2audio11. AM layeringaudiocv
CV scaler for sequencer
Sequencer CV into IN A (DC-coupled) · BIAS A at zero · CV A attenuator sets scaling · EXP-LIN at linear · use OUT A as pre-scaled pitch CV to a second VCO for tracking offsets
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: µVCA II, Sequencer, Offset Source, VCO 2. Signals: 1 cv, 2 pitch.µVCA IISequencerOffset SourceVCO 2EXP-LIN A=LIN (for clean CV) · BIAS A=0: IN A1v/octCV AcvOUT A1v/octPitch1v/octOutcvV/Oct1v/oct11. scaled pitch CVcvpitch
★ Side-chain ducking
Pad into IN A · inverted envelope from kick drum trigger into CV A · BIAS A around 3 V so pad sits at ~unity when nothing plays · each kick briefly ducks the pad · classic dance-floor pump
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: µVCA II, Pad, Kick Trigger, Envelope, Inverter, Output. Signals: 2 audio, 2 cv, 1 trigger.µVCA IIPadKick TriggerEnvelopeInverterOutputEXP-LIN A=LIN · BIAS A ~3V: IN AaudioCV AcvOUT AaudioOutaudioOuttrigTrigtrigOutcvIncvOutcvInaudio11. side-chain duckaudiocvtrigger

Behaviors

Cascaded Mixer Mode OUT A unpatched

With nothing plugged into OUT A, amp A's signal is internally normalized into OUT B. Two VCA channels become a CV-controlled 2-channel mixer from a single jack.

Above-Unity Gain CV > 5V or BIAS past noon

Both BIAS and CV sum; voltages above 5V drive gain past 1. Useful for reviving weak signals, boosting envelope shapes, or fattening up synth outs before a filter.

Continuous Linear/Exp Blend EXP-LIN knob per channel

Sweep smoothly between linear (audio-accurate level control) and exponential (envelope-following that feels punchy). The middle region is a subtle response that works well as a DC-coupled CV attenuator.

DC-Coupled Signal Path always

CV can be passed through the amp as easily as audio. Scale envelopes, attenuate pitch sequences, or amplitude-modulate one CV with another — this is a VCA that doubles as a utility processor.

Controls

Channel A CV A Attenuates the CV A input before it sums with BIAS A.
CCW: zero · CW: unity · LED tracks resulting CV level
Channel A BIAS A Sets initial gain of amp A before CV is applied. Max bias = 5V = gain of 1.
Use as manual level when no CV patched · summed with CV A
Channel A EXP-LIN A Blends response curve between linear and exponential.
CCW: linear (audio VCA feel) · CW: exponential (CV/envelope feel)
Channel B CV B CV attenuator for channel B. Identical to CV A.
CCW: zero · CW: unity
Channel B BIAS B Manual level / bias offset for amp B.
5V = unity gain · summed with CV B
Channel B EXP-LIN B Blends channel B response between linear and exponential.
CCW: linear · CW: exponential

I/O

IN · 4

  • CV A 0–5V typical · above 5V boosts CV
    Level CV for amp A, summed with BIAS A. Voltages above 5V give above-unity gain
  • IN A audio/CV CV
    Signal input for amp A. DC-coupled so audio or CV can pass
  • CV B 0–5V typical · above 5V boosts CV
    Level CV for amp B, summed with BIAS B
  • IN B audio/CV CV
    Signal input for amp B. DC-coupled

OUT · 2

  • OUT A audio/CV CV
    Amp A output. When unpatched, signal is normalized into OUT B for cascaded mixing
  • OUT B audio/CV CV
    Amp B output. Sums OUT A when OUT A is unpatched — acts as simple 2-channel mixer output