alm-busy-circuits/tangle-quartet
Tangle Quartet
8 HP quad linear VCA built around THAT 2164 VCA ICs. Four independent DC-coupled linear VCAs, each with its own signal input, level/CV input, and individual output, plus a summed mix output. CV inputs are normalled to +5V so each channel doubles as a manual level control, making it usable as a clean four-channel mixer as well as a VCA bank. Marketed as a no-frills, bleed-free linear VCA; reverse-polarity protected and skiff-friendly.580
Capabilities 4
- Cascading Mixercascading-mixer
- Each channel output is normalled to the Mix bus; patching a channel out removes it from the sum.
- Mixermixer
- Mix output sums all channels whose individual outputs are not patched.580
- Quad VCAquad-vca
- Four independent THAT-2164 linear VCA channels with a summed mix output; +5V-normalled CV inputs let each channel act as a manual level control.580
- Voltage-Controlled Amplifiervca
- Four independent linear VCAs using 2164 ICs, each with individual output and CV level control.580
Jacks 13 — 8 in / 5 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (8) | |||
| CH1 CV | cv | — | CV level input; normalled to +5V when unpatched, enabling manual amplitude control via the attenuator knob alone.580 |
| CH1 In | mixed | — | DC-coupled signal input; accepts audio or CV signals.580 |
| CH2 CV | cv | — | CV level input; normalled to +5V when unpatched, enabling manual amplitude control via the attenuator knob alone.580 |
| CH2 In | mixed | — | DC-coupled signal input; accepts audio or CV signals.580 |
| CH3 CV | cv | — | CV level input; normalled to +5V when unpatched, enabling manual amplitude control via the attenuator knob alone.580 |
| CH3 In | mixed | — | DC-coupled signal input; accepts audio or CV signals.580 |
| CH4 CV | cv | — | CV level input; normalled to +5V when unpatched, enabling manual amplitude control via the attenuator knob alone.580 |
| CH4 In | mixed | — | DC-coupled signal input; accepts audio or CV signals.580 |
| Outputs (5) | |||
| CH1 Out | mixed | — | Individual VCA output for channel 1. When patched, this channel's signal is removed from the Mix output.580 |
| CH2 Out | mixed | — | Individual VCA output for channel 2. When patched, this channel's signal is removed from the Mix output.580 |
| CH3 Out | mixed | — | Individual VCA output for channel 3. When patched, this channel's signal is removed from the Mix output.580 |
| CH4 Out | mixed | — | Individual VCA output for channel 4. When patched, this channel's signal is removed from the Mix output.580 |
| Mix | mixed | — | Combined output that sums all channels whose individual outputs are not patched.580 |
Parameters 4
| Name | Type | Range | Behavior |
|---|---|---|---|
| CH1 Level | knob | — | Attenuates the CV level input for channel 1. Fully CW with +5V CV gives unity gain; fully CCW or 0V CV gives zero output. CV above 5V amplifies the signal. The LED indicates post-attenuation CV level.580 |
| CH2 Level | knob | — | Attenuates the CV level input for channel 2. Fully CW with +5V CV gives unity gain; fully CCW or 0V CV gives zero output. CV above 5V amplifies the signal. The LED indicates post-attenuation CV level.580 |
| CH3 Level | knob | — | Attenuates the CV level input for channel 3. Fully CW with +5V CV gives unity gain; fully CCW or 0V CV gives zero output. CV above 5V amplifies the signal. The LED indicates post-attenuation CV level.580 |
| CH4 Level | knob | — | Attenuates the CV level input for channel 4. Fully CW with +5V CV gives unity gain; fully CCW or 0V CV gives zero output. CV above 5V amplifies the signal. The LED indicates post-attenuation CV level.580 |
Firmware history 0 versions
No firmware history recorded.
References 2
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[580]
ALM-009 Tangle Quartet Operation Manualmanual● verified 2026-05-21
- [581]