914 extended fixed filter bank

moog914 · filters · schema v1

914 Extended-Range Fixed Filter Bank (moogafakkin System 55 clone — categorized under Ports -> moogafakkin). The extended fixed filter bank: 1 high-pass + 1 low-pass + 12 fixed center-frequency band-pass cells (12 dB/oct), each level-knob-controlled, summed to one output. Shares the moog-filterbank center-frequency lib with the 907A. Own-code (textbook biquad bank). Beige moogafakkin faceplate (the intrinsic always-on look shared by the moogafakkin module family).

A recreation of the Moog 914 Extended Fixed Filter Bank — the System 55's full fixed filter bank, the bigger sibling of the 907A and a kind of fixed graphic EQ for spectral and formant shaping. The signal fans into fourteen parallel filter sections whose centre frequencies DO NOT move: a fixed low-pass shelf at the bottom, TWELVE fixed band-pass sections in the classic 1/3-octave series (125 Hz, 175, 250, 350, 500, 700, 1 kHz, 1.4 k, 2 k, 2.8 k, 4 k, 5.6 k), and a fixed high-pass shelf at the top. Each section has its own LEVEL knob and all sum to one output, so you sculpt a sound by boosting and cutting fixed regions — emphasise formants, notch harsh bands, or carve detailed vocal/telephone tones with finer resolution than the 907A. The bands never move and there is no CV: a pure Web Audio biquad + gain graph, identical wiring to the 907A with twelve bands instead of eight. At the default 0.5 every band passes at half level, a neutral middle to boost or cut from.

the faceplate

1 inputs · 1 outputs · 2 params

about this module

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

inputs

id	cable	what it does
`audio`	audio	The signal to filter — fanned in parallel into every fixed filter section. audio signal

outputs

id	cable	what it does
`audio`	audio	The summed multi-band output — every section's contribution added together, the shaped spectrum. audio signal

params

id	label	range	default	curve
`hp`	HP	0..1	0.5	linear
`lp`	LP	0..1	0.5	linear

controls

control	what it does
Band1	Level of the fixed 125 Hz band-pass section (bass / fundamental). Defaults to 0.5.
Band10	Level of the fixed 2.8 kHz band-pass section (high presence). Defaults to 0.5.
Band11	Level of the fixed 4 kHz band-pass section (clarity / edge). Defaults to 0.5.
Band12	Level of the fixed 5.6 kHz band-pass section (brilliance / sizzle). Defaults to 0.5.
Band2	Level of the fixed 175 Hz band-pass section (low end / warmth). Defaults to 0.5.
Band3	Level of the fixed 250 Hz band-pass section (low mids / body). Defaults to 0.5.
Band4	Level of the fixed 350 Hz band-pass section (lower mids). Defaults to 0.5.
Band5	Level of the fixed 500 Hz band-pass section (mids). Defaults to 0.5.
Band6	Level of the fixed 700 Hz band-pass section (mids). Defaults to 0.5.
Band7	Level of the fixed 1 kHz band-pass section (presence). Defaults to 0.5.
Band8	Level of the fixed 1.4 kHz band-pass section (presence / nasal). Defaults to 0.5.
Band9	Level of the fixed 2 kHz band-pass section (upper mids / bite). Defaults to 0.5.
HP	Level of the fixed HIGH-PASS section at the top of the bank (corner ~7.5 kHz) — raise to add air and brightness, cut to soften the top. Defaults to 0.5.
LP	Level of the fixed LOW-PASS section at the bottom of the bank (corner ~100 Hz) — raise to add sub weight, cut to thin the bottom. Defaults to 0.5.

source

moog914.ts on GitHub.