cp3 mixer

moogCp3 · utilities · schema v1

CP3 / CP3A Console Panel — the console mixer slice of the moogafakkin System 55/35 clone (categorized under Ports -> moogafakkin). A multi-function console: (1) a 4x1 summing mixer that presents a (+) output AND a (-) phase-inverted output simultaneously, max per-channel gain x2 (0.5 = unity, 1.0 = x2), mixing AC and/or DC voltages (audio AND cv alike — the per-sample sum is polarity- and DC-transparent); (2) the 4th input adds an EXTERNAL jack (ext4) plus an ATTENUATOR — at "10" (1.0) the attenuator is unity so a direct patch passes through unaltered; (3) a MULTIPLE — input 1 fanned out unaltered to three passthrough outs (1 -> 3); (4) trunk/reference jacks supplying a constant +12V and -6V reference (scaled into the project normalized CV convention). Four 25K-LIN input level knobs (shown 0-10) + the 4th-input attenuator. DSP is own-code: a forked + expanded version of the repo mixer (not a port of any moogafakkin schematic or copyleft source — permissive only). Beige moogafakkin faceplate (the intrinsic always-on look shared by the moogafakkin module family). v1 omits the CP3A trunk/routing-switch matrix (the reference jacks are modeled as constant sources); the switch matrix is a planned follow-up.

A clean-room recreation of the Moog CP3 / CP3A Console Panel mixer — the System's multi-function summing mixer. Four channels (IN 1–4) each have their own level fader and are summed to a (+) OUTPUT; a (−) OUTPUT carries the same mix phase-inverted (for difference/cancellation patches or feeding a second chain out of phase). The 4th channel adds an EXTERNAL jack (EXT 4) that's summed with IN 4 then trimmed by its own attenuator. The panel also provides a 1→3 MULTIPLE (IN 1 fanned, unaltered, to three jacks for splitting a signal) and two constant trunk reference voltages (+12 V and −6 V, normalized) for offsetting CVs. It mixes audio AND CV transparently (the sum is DC- and polarity-correct). Mental model: a four-into-one mixer with a built-in inverter, a signal splitter, and a couple of fixed-voltage 'rails' on the side.

the faceplate

5 inputs · 7 outputs · 5 params

about this module

Hover a control, or open the patch panel and hover a jack.

inputs

id	cable	what it does
`in1`	audio	Mixer channel 1 input — scaled by the CH1 fader and summed into both the (+) and (−) outputs. (This is also the signal fed to the 1→3 MULTIPLE.) audio signal
`in2`	audio	Mixer channel 2 input — scaled by CH2 and summed into the output buses. audio signal
`in3`	audio	Mixer channel 3 input — scaled by CH3 and summed into the output buses. audio signal
`in4`	audio	Mixer channel 4 (panel jack) — summed with the EXT 4 jack, trimmed by ATT 4, then scaled by CH4 into the output buses. audio signal
`ext4`	cv	The 4th channel's EXTERNAL input jack — summed with IN 4 and scaled by the ATT 4 attenuator (at unity it passes a direct patch unaltered). Accepts audio or CV; it's the signal being attenuated, not a knob modulator. control voltage (CV)

outputs

id	cable	what it does
`out_positive`	audio	The (+) summed mix bus: CH1·in1 + CH2·in2 + CH3·in3 + CH4·(in4 + ext4·ATT4). The main mixer output. audio signal
`out_negative`	audio	The (−) output: the same mix, phase-inverted. Use it for cancellation/difference patches or to feed a parallel chain out of phase. audio signal
`multiple_one`	audio	MULTIPLE tap 1 — IN 1 passed through unaltered (the 1→3 signal splitter, independent of the CH1 fader). audio signal
`multiple_two`	audio	MULTIPLE tap 2 — a second unaltered copy of IN 1. audio signal
`multiple_three`	audio	MULTIPLE tap 3 — a third unaltered copy of IN 1. audio signal
`plus_twelve`	cv	A constant +12 V reference trunk (normalized): a fixed positive CV for offsetting/biasing other control voltages. control voltage (CV)
`minus_six`	cv	A constant −6 V reference trunk (normalized): a fixed negative CV offset. control voltage (CV)

params

id	label	range	default	curve
`ch1`	Ch1	0..1	1	linear
`ch2`	Ch2	0..1	1	linear
`ch3`	Ch3	0..1	1	linear
`ch4`	Ch4	0..1	1	linear
`attenuator4`	Att 4	0..1	1	linear

controls

control	what it does
Att 4	The 4th input's EXTERNAL attenuator: trims the EXT 4 jack before it joins IN 4 (1.0 = unity, a direct patch passes unaltered).
Ch1	Channel 1 level (0..×2 gain; ~0.5 is unity, 1.0 is ×2), shown 0–10 on the faceplate — how much of IN 1 reaches the output buses.
Ch2	Channel 2 level (0..×2; ~0.5 unity, 1.0 ×2).
Ch3	Channel 3 level (0..×2; ~0.5 unity, 1.0 ×2).
Ch4	Channel 4 level (0..×2; ~0.5 unity, 1.0 ×2) — applied to the summed IN 4 + EXT 4 signal.

source

moog-cp3.ts on GitHub.