992 control voltage panel

moog992 · modulation · schema v1

992 Control Voltage Panel (moogafakkin System 55/35 clone — categorized under Ports -> moogafakkin). A passive CV summer/attenuator: four CV inputs each pass through a per-channel ATTENUATOR (0..1) into a common summing bus (cv_out). Channel 4 is SIGNAL-INVERTING — its attenuator subtracts from the sum — so the panel can both add and cancel control voltages. No audio path; pure CV math (own-code, permissive). Beige moogafakkin faceplate (the intrinsic always-on look shared by the moogafakkin module family).

A clean-room recreation of the Moog 992 Control Voltage Panel — a passive 4-into-1 CV mixer/attenuator. Each of the four CV inputs passes through its own attenuator (0 = off, 1 = unity) and the four are summed onto a single CV OUT. Channel 4 is signal-INVERTING: its attenuator subtracts from the sum, so the panel can both add and subtract control voltages — handy for offsetting one CV by another, blending modulation sources, or building a difference (cv1 − cv4). Mental model: a small CV mixing desk — set how much of each source reaches the output, with channel 4 wired backwards so it cancels rather than adds. CV-only (no audio in or out).

the faceplate

4 inputs · 1 outputs · 4 params

inputs

id	cable	what it does
`cv1`	cv	Control-voltage input 1 — scaled by ATT 1 and added to the summed output. control voltage (CV)
`cv2`	cv	Control-voltage input 2 — scaled by ATT 2 and added to the summed output. control voltage (CV)
`cv3`	cv	Control-voltage input 3 — scaled by ATT 3 and added to the summed output. control voltage (CV)
`cv4`	cv	Control-voltage input 4 — scaled by ATT 4 and SUBTRACTED from the summed output (this channel is inverting), so it offsets or cancels the other three. control voltage (CV)

outputs

id	cable	what it does
`cv_out`	cv	The summed control voltage: cv1·ATT1 + cv2·ATT2 + cv3·ATT3 − cv4·ATT4. Patch it wherever a single combined CV is wanted (a filter cutoff, an oscillator's pitch, another module's CV input). control voltage (CV)

params

id	label	range	default	curve
`atten1`	Att 1	0..1	1	linear
`atten2`	Att 2	0..1	1	linear
`atten3`	Att 3	0..1	1	linear
`atten4`	Att 4	0..1	1	linear

controls

control	what it does
Att 1	Attenuator for input 1: how much of cv1 reaches the sum, from 0 (muted) to 1 (unity / full level).
Att 2	Attenuator for input 2: how much of cv2 reaches the sum, 0 (muted) to 1 (unity).
Att 3	Attenuator for input 3: how much of cv3 reaches the sum, 0 (muted) to 1 (unity).
Att 4	Attenuator for the INVERTING input 4: how much of cv4 is subtracted from the sum, 0 (no effect) to 1 (full inverted level). Use it to offset or cancel the other channels.

source

moog992.ts on GitHub.