903a random signal generator

moog903a · sources · schema v1

903A Random Signal Generator (moogafakkin System 55/35 clone — categorized under Ports -> moogafakkin). Passive white + pink noise source with two independent audio taps (WHITE = flat spectrum; PINK = -3 dB/oct, Voss-McCartney), scaled by a single LEVEL knob. No inputs. Own-code (public-domain noise technique). Beige moogafakkin faceplate (the intrinsic always-on look shared by the moogafakkin module family).

A clean-room recreation of the Moog 903A Random Signal Generator — the System 55/35 noise source. It generates two independent flavours of noise on two outputs at once: full-spectrum WHITE noise (equal energy per Hz, bright and hissy) and PINK noise (-3 dB/octave, equal energy per octave, darker and more natural-sounding). It has no inputs and no CV — just a single LEVEL knob that scales both taps together. Mental model: an analog noise panel; patch WHITE into a filter for percussion and S&H, or PINK for wind/rumble textures. (As CV, slow random noise into a sample & hold makes random voltages.)

the faceplate

0 inputs · 2 outputs · 1 params

outputs

id	cable	what it does
`white`	audio	Full-spectrum white noise (equal energy at every frequency) — bright and hissy. Classic source for hi-hats/snares through a filter, or for sampling into a sample & hold. audio signal
`pink`	audio	Pink noise, rolled off at -3 dB/octave (equal energy per octave) — darker and warmer than white, good for wind/rumble beds and gentler random textures. audio signal

params

id	label	range	default	curve
`level`	Level	0..1	0.8	linear

controls

control	what it does
Level	Master output level applied to BOTH the white and pink taps at once, 0 (silent) to 1 (full). There is no per-output trim — the two taps always share this gain.

source

moog903a.ts on GitHub.