FUMANA

Frap Tools 42HP
FILTER RESONATOR EFFECTS EQ

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Dual all-analog 16-band spectral filter bank. Parallel bandpass array with per-band faders and CV, Tilt/Scan macros, odd/even splits, and a dual envelope-follower modulator path for 16-band vocoding and dynamic spectral transfer.

Patch Ideas · 9

★ Classic 16-band vocoder
Square-wave VCO into Main In (blue) as carrier · voice microphone into Mod In (grey) · all faders to unity · E.F. Attack fast, E.F. Release medium · All Out delivers the sung carrier · tune the VCO to match voice fundamental.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: FUMANA, VCO, Mic Preamp, Noise, Output. Signals: 4 audio.FUMANAVCOMic PreampNoiseOutputFaders 1-16: unityE.F. Attack: fastE.F. Release: mediumUnvoiced In: pink noiseMain Odd InaudioMod Odd InaudioUnvoiced InaudioAll OutaudioSquareaudioOutaudioPinkaudioInaudioaudio
Dual 8-band vocoder
Square into Main Odd · triangle into Main Even · drums into Mod Odd · vocal into Mod Even · Odd Out = drum-modulated square (8 bands), Even Out = voice-modulated triangle (8 bands) · two independent vocoders sharing the same 16-band hardware.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 6 connections. Modules: FUMANA, VCO 1, VCO 2, Drums, Voice, Mixer. Signals: 6 audio.FUMANAVCO 1VCO 2DrumsVoiceMixerFaders 1-16: unityMain Odd InaudioMain Even InaudioMod Odd InaudioMod Even InaudioOdd OutaudioEven OutaudioSquareaudioTriangleaudioOutaudioOutaudioIn 1audioIn 2audioaudio
★ Spectral sidechain ducking
Drum bus through Main · bassline envelope into Tilt CV · each kick tilts the band distribution upward (attenuates lows) · bass breathes back in during rests · more musical than a broadband sidechain.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: FUMANA, Drum Bus, Kick Envelope, Output. Signals: 2 audio, 1 cv.FUMANADrum BusKick EnvelopeOutputTilt CV Attenuverter: ~2 o'clockMain Odd InaudioTilt CVcvAll OutaudioOutaudioOutcvInaudioaudiocv
Parametric sweep
Pink noise into Main · LFO into Center CV · Width set to 3 bands · Peak/Notch CW for peak · LFO sweeps a resonant peak across the 16-band spectrum · sample-and-hold at Center CV gives stepped band jumps instead of sweeps.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: FUMANA, Noise, LFO, Output. Signals: 2 audio, 1 cv.FUMANANoiseLFOOutputFaders 1-16: unityPeak/Notch: CW (peak)Width: ~3 bandsMain Odd InaudioCenter CVcvAll OutaudioPinkaudioOutcvInaudioaudiocv
Cross-wired vocoder
Voice into Mod In · VCO into Main · patch Individual E.F. outputs into Individual Band CV inputs in a shuffled pattern — E.F. 1 → Band 16 CV, E.F. 16 → Band 1 · high voice formants open low carrier bands and vice versa · inverted spectral character.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 6 connections. Modules: FUMANA, Voice, VCO, Output. Signals: 3 audio, 3 cv.FUMANAVoiceVCOOutputMod Odd InaudioMain Odd InaudioBand 16 CVcvBand 1 CVcvBand 9 CVcvE.F. 1 OutcvE.F. 16 OutcvE.F. 8 OutcvAll OutaudioOutaudioSawaudioInaudioaudiocv
16-band analyser
Audio into Mod Odd · take the 16 Individual E.F. outputs as spectral CVs · route the All E.F. out as a broadband amplitude envelope · use spectral CVs to drive external oscillators for additive resynthesis.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: FUMANA, Audio Src, VCO 1, VCO 2, VCO 3, Master VCA. Signals: 1 audio, 4 cv.FUMANAAudio SrcVCO 1VCO 2VCO 3Master VCAMod Odd InaudioE.F. 1 OutcvE.F. 4 OutcvE.F. 8 OutcvAll E.F. OutcvOutaudioAmp CVcvAmp CVcvAmp CVcvCVcvaudiocv
Per-band effects send
Individual Band 10 Out → delay send · delay return mixed back in · the tenth band of the spectrum gets an echo tail while all other bands stay dry · carrier bank continues to pass full signal via All Out · parallel wet band.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: FUMANA, Carrier, FX, Mixer. Signals: 4 audio.FUMANACarrierFXMixerFaders 1-16: unityMain Odd InaudioBand 10 OutaudioAll OutaudioOutaudioInaudioOutaudioWet InaudioDry Inaudioaudio
★ Spectral freeze with faders
Patch modulator with brief phrase · set E.F. Release CW (long) · immediately after the phrase, all VCAs stay open at their last-sampled levels · manual fader adjustments freeze a static spectral emphasis derived from the sampled moment.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: FUMANA, Voice, Drone, Output. Signals: 3 audio.FUMANAVoiceDroneOutputE.F. Attack: fastE.F. Release: very long (CW)Mod Odd InaudioMain Odd InaudioAll OutaudioOutaudioOutaudioInaudioaudio
Notch scan for hollowness
Voice through Main · Peak/Notch CCW (notch) · Width ~half · slow LFO into Center CV · a 3-band notch crawls across the voice spectrum creating cyclic tonal absence · strong phasing-like effect without phaser delay.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: FUMANA, Voice, Slow LFO, Output. Signals: 2 audio, 1 cv.FUMANAVoiceSlow LFOOutputPeak/Notch: CCW (notch)Width: ~halfMain Odd InaudioCenter CVcvAll OutaudioOutaudioOutcvInaudioaudiocv

Behaviors

16-band spectral transfer patch carrier → Main in, modulator → Mod in

Modulator feeds its own 16-filter analysis array. Each analysis filter drives an envelope follower whose output is semi-normalled to the corresponding main-filter VCA CV. The modulator's spectral footprint opens the carrier's matching bands. Classic 16-band analog vocoding when carrier is harmonic.

Sixth-order modulator filters always (modulation path)

Mod analysis filters are 6th-order (36 dB/oct) with a further stage that compensates band energy — distinct from the main 8th-order array (48 dB/oct). Band extraction is slightly less steep on the analysis side by design for smoother envelope curves.

Semi-normal per-band break patch a cable into any Individual Band CV input

Envelope-follower normal to each VCA is broken only for that specific band when a jack is patched. The other 15 bands keep the envelope-following behaviour. Patch Individual E.F. outs in a shuffled order to bend-vocode (voice hits at one frequency open a different band on the carrier).

Odd/Even splitting patch only Odd or Even input

Inputs are semi-normalled in pairs (Main Odd ↔ Main Even, Mod Odd ↔ Mod Even). When one jack is patched it auto-feeds the other. Break the normal by patching both to different sources: the module becomes two 8-band vocoders operating independently on odd and even bands.

Parametric scanning Center / Width / Peak-Notch knobs

Acts as a three-variable parametric EQ across the 16 bands. Centre selects fulcrum band, Width extends emphasis to neighbours, Peak/Notch sets positive (peak) or negative (notch) gain. Centre is audible only when Width > fully-CCW. Off position for Peak/Notch sits around noon but varies per unit.

Tilt fulcrum at 8/9 Tilt knob

Tilt pivots around bands 8-9. Emphasises one half while attenuating the other proportionally — more distant bands are affected more strongly. Use a kick-drum envelope into Tilt CV input to ducking-sidechain the lower spectrum on each hit, reinforcing the higher register.

Unvoiced section patch audio into Unvoiced In + modulator into Mod In

Bands 14 & 15 have dedicated second envelope followers + VCAs that switch their source from the main signal to the Unvoiced audio when the modulator hits those bands. Fricatives/sibilants in voice modulator inject noise bursts from the Unvoiced input into the carrier. Preserves sound instead of muting it (unlike a traditional de-esser).

Individual band taps pre-VCA patch Individual Band Output

Each of the 16 direct outputs taps the filter before the fader/VCA. Patching does not affect the fader's role in the All/Odd/Even mix — use these to parallel-process a band (band 10 to a delay send, band 4 to a distortion) while the bank continues normal duty.

Audio-rate CV at per-band inputs audio into Individual Band CV input

CV inputs accept signals up to ~1 kHz with a lowpass roll-off past that. Patching an audio-rate signal into a band CV performs amplitude modulation on that single band — 16 parallel AM channels selectable per-band.

Envelope follower as spectral CV source no carrier patched

The 16 Individual E.F. outputs are usable as a 16-voice spectral analyser regardless of the main path. Take any audio through Mod In and use the envelope outs to drive external filters, VCAs, or quantised sequencers — FUMANA becomes a pure analysis tool.

Controls

Main filter bank Band Faders (×16) Per-band amplitude of the main 16 bandpass filters.
bottom: VCA closed · top: unity · red LED per band
Audio input Main Odd Level Input gain for odd-band main signal.
bands 1, 3, 5, 7, 9, 11, 13, 15 · expects ~10 Vpp modular level
Audio input Main Even Level Input gain for even-band main signal.
bands 2, 4, 6, 8, 10, 12, 14, 16
Modulation input Mod Odd Level Input gain for odd-band modulator signal (vocoder input).
feeds 16 analysis filters → envelope followers
Modulation input Mod Even Level Input gain for even-band modulator signal.
semi-normalled to Mod Odd jack
Unvoiced input Unvoiced Level Input gain for the fricative/sibilant detector channel.
white/pink noise recommended · detects sharp transients in bands 14 & 15 of modulator
Macro Spectral Editing Tilt Seesaw between low and high bands around fulcrum at bands 8/9.
CCW: emphasise 1-8 · noon: flat · CW: emphasise 9-16 · ±10 V CV
Parametric Scanning Peak/Notch Positive gain (peak) or negative gain (notch) at the Scan centre.
CCW: notch · noon: no emphasis · CW: peak · ±10 V CV input
Parametric Scanning Center Centre frequency of the parametric scan.
CCW: band 1 · CW: band 16 · continuous · ±10 V CV
Parametric Scanning Width Number of bands flanking Centre affected by Peak/Notch.
CCW: only centre band · CW: all 16 bands · Centre audible only if Width > 0 · ±10 V CV
Envelope Followers E.F. Attack Attack time of the 16 modulator envelope followers.
CCW: fastest transient response · non-conventional (for formant sculpt)
Envelope Followers E.F. Release Release time of the 16 modulator envelope followers.
CCW: fastest release
Tilt / Peak-Notch / Center / Width CV Input Attenuverters Scales the CV input to each macro control.
one per macro CV · bipolar
Audio Outputs Odd/Even Phase Inversion Switch Inverts phase of Odd or Even sum relative to All.
for dynamic spectral subtraction / reinforcement when summed externally

I/O

IN · 8

  • Main Odd In / Main Even In modular level, ~10 Vpp AUDIO
    Carrier audio input, pre-split into odd and even bands. Semi-normalled together so one cable feeds both.
    NORM → odd ↔ even via single-cable detection
  • Mod Odd In / Mod Even In modular level, ~10 Vpp ENV
    Modulator audio (vocoder analysis source). Fed through 16 analysis bandpass filters + envelope followers.
    NORM → odd ↔ even when only one patched
  • Unvoiced In noise source recommended · ±10 V AUDIO
    Additional input for fricatives/sibilants. Detector reroutes bands 14 & 15 to this audio when detected.
  • Individual Band CV Inputs (×16) ±10 V · audio-rate capable (up to ~1 kHz) ENV
    Per-band VCA CV, one under each fader. Breaks semi-normal from envelope follower.
    NORM → corresponding envelope follower output (sum at input)
  • Tilt CV ±10 V usable · 10 V knob offset CV
    Voltage over the Tilt macro.
  • Peak/Notch CV ±10 V usable · 10 V knob offset CV
    Voltage over the parametric Gain macro.
  • Center CV ±10 V usable · 12 V knob offset CV
    Voltage over the parametric Center frequency.
  • Width CV ±10 V usable · 9 V knob offset CV
    Voltage over the parametric Width.

OUT · 6

  • All Out modular audio · 48 dB/oct bands AUDIO
    Sum of all 16 filtered bands with additional 8th-order lowpass at 18 kHz. Slightly smoother than summing Odd+Even.
  • Odd Out modular audio · phase-switchable AUDIO
    Sum of bands 1, 3, 5, 7, 9, 11, 13, 15 post-VCA. Pre-VCA individual filter taps not present here.
  • Even Out modular audio · phase-switchable AUDIO
    Sum of bands 2, 4, 6, 8, 10, 12, 14, 16 post-VCA.
  • Individual Band Outputs (×16) modular audio AUDIO
    Pre-VCA direct filter tap per band. Not affected by the fader or VCA — parallel-process a band independently.
  • All E.F. Out 0 – 10 V · small negative bias (offset) ENV
    Sum of all 16 envelope followers. Composite amplitude envelope of the modulator signal.
  • Individual E.F. Outputs (×16) 0 – 10 V · ±5 % tolerance ENV
    Per-band envelope-follower CV. Usable as 16-band spectral analysis signal independent of the VCAs.