Dual VCA 1U

Intellijel 8HP
VCA UTILITY MIXER

Verified sheet

The facts on this sheet have been cross-checked against the sources below.

Sources
Suggest a correction

Dual linear VCA in 1U format. IN A normalizes to IN B; CV A normalizes to CV B. VCA A output normalizes to VCA B for stereo or summed mono operation. Unity gain at 5V CV.

Patch Ideas · 3

Stereo tremolo
Osc L → IN A · Osc R → IN B · LFO → CV A (normalizes to CV B)
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 5 connections. Modules: Dual VCA 1U, Osc L, Osc R, LFO, Mixer. Signals: 4 audio, 1 cv.Dual VCA 1UOsc LOsc RLFOMixerIN AaudioIN BaudioCV AcvVCA AaudioVCA BaudioOutaudioOutaudioOutcvLaudioRaudio11. normalizes to CV Baudiocv
Envelope shaping
Audio → IN A · Envelope → CV A · VCA A out → mixer
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: Dual VCA 1U, VCO, Envelope, Mixer. Signals: 2 audio, 1 cv.Dual VCA 1UVCOEnvelopeMixerIN AaudioCV AcvVCA AaudioOutaudioOutcvInaudioaudiocv
Summed mono with two sources
Source1 → IN A · Source2 → IN B · leave VCA A unpatched · VCA B = mix
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Dual VCA 1U, Source1, Source2, Envelope, Envelope2, Mixer. Signals: 3 audio, 2 cv.Dual VCA 1USource1Source2EnvelopeEnvelope2MixerIN AaudioIN BaudioCV AcvCV BcvVCA BaudioOutaudioOutaudioOutcvOutcvInaudio11. A sums into Baudiocv

Behaviors

Stereo VCA cables → both IN A and IN B

Both channels operate independently. Patch separate CV to each for independent gain control of a stereo signal.

Summing mixer VCA A output unpatched

With VCA A jack empty, both channels are summed and appear at VCA B output. Single CV A controls both if CV B is also unpatched.

Single-input dual send IN A patched, IN B unpatched

IN A normalizes to IN B, so one source can be independently level-controlled to two destinations.

Controls

I/O

IN · 4

  • IN A CV
    Audio or CV input for VCA A. Normalizes to IN B when IN B is unpatched.
    NORM → IN B
  • CV A 0–10V CV
    CV control for VCA A gain. 0V = no output, 5V = unity, 10V = +6dB. Normalizes to CV B.
    NORM → CV B
  • IN B any CV
    Audio or CV input for VCA B.
  • CV B 0–10V CV
    CV control for VCA B gain.

OUT · 2

  • VCA A AUDIO
    Output of VCA A. If unpatched, VCA A mixes into VCA B output.
    NORM → VCA B (summed)
  • VCA B follows input scaled by CV CV
    Output of VCA B. Contains sum of A+B when VCA A jack is unpatched.