ATTE

Befaco 4HP
ATTENUATOR ATTENUVERTER UTILITY MULT

Verified sheet

The facts on this sheet have been cross-checked against the sources below.

Sources
Suggest a correction

Quad unity-gain attenuator/inverter with cascaded input normalization · per-channel +/- switch flips between attenuator and inverter · IN A normalled to +10V so unpatched channels act as manual offset generators.

Patch Ideas · 6

★ Four manual offsets
All INs empty · IN A normalled to +10V propagates to B, C, D · each knob becomes a 0-10V offset · flip channel switches to − for negative offsets · feed four destinations that need static CV with no external module
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: ATTE, VCO 1, VCO 2, Filter, VCA. Signals: 4 cv.ATTEVCO 1VCO 2FilterVCAAll INs: unpatchedCH 1: + · knob sets offsetCH 2: − · knob sets negative offsetCH 3-4: + · tasteOUT AcvOUT BcvOUT CcvOUT DcvFMcvDetunecvCutoffcvBiascvcv
★ LFO splitter with depth per destination
LFO → IN A · cascade feeds B, C, D · each knob dials modulation depth independently · switch on one channel to − for out-of-phase modulation · one source modulates four parameters at different intensities and polarities
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: ATTE, LFO, VCO, Filter, VCA, Pan. Signals: 5 cv.ATTELFOVCOFilterVCAPanCH 1-3: + · depth to tasteCH 4: − · inverted copyIN AcvOUT AcvOUT BcvOUT CcvOUT DcvOutcvFMcvCutoffcvCVcvCVcv11. invertedcv
★ Attenuverter for bipolar CV
Bipolar CV (±5V) → IN A · switch to − to send −5..+5 inverted · knob scales 0-100% of the signal · zero at full CCW makes muting precise · useful for taming a hot source or flipping a modulation polarity
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 2 connections. Modules: ATTE, LFO, Filter. Signals: 2 cv.ATTELFOFilterCH 1: switch − · knob = depthIN AcvOUT AcvOutcvCutoffcv11. inverted, attenuatedcv
Two stereo attenuators (2+2 split)
Patch L and R of signal pair one into IN A and IN B (breaks cascade at B) · signal pair two into IN C and IN D · knobs A+B act as linked stereo level for pair one, C+D for pair two · true stereo two-channel sub-mixer
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 8 connections. Modules: ATTE, Reverb, Delay, Mixer. Signals: 8 audio.ATTEReverbDelayMixerCH 1-2: pair 1 levelCH 3-4: pair 2 levelIN AaudioIN BaudioIN CaudioIN DaudioOUT AaudioOUT BaudioOUT CaudioOUT DaudioOut LaudioOut RaudioOut LaudioOut RaudioIn L1audioIn R1audioIn L2audioIn R2audio11. break cascadeaudio
Envelope + manual offset bias
Envelope → IN A (breaks cascade to CH 1 only) · IN B unpatched inherits +10V · knob B becomes a bias offset · sum envelope and offset externally at a filter cutoff for a floor-plus-envelope shape · add two more offsets on C and D
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: ATTE, Envelope, Mixer, Filter. Signals: 4 cv.ATTEEnvelopeMixerFilterCH 1: + · envelope depthCH 2: + · bias offsetIN AcvOUT AcvOUT BcvOutcvIn 1cvIn 2cvSumcvCutoffcv121. envelope scaled2. +10V × knob Bcv
Inverted VCO for through-zero FM
VCO → IN A · switch to − · knob dials modulation index · OUT A → FM input of another VCO · adding a second ATTE channel (+) of the same source to a separate FM bus gives simultaneous upper- and lower-sideband weighting
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 3 connections. Modules: ATTE, VCO A, VCO B, VCO C. Signals: 3 audio.ATTEVCO AVCO BVCO CCH 1: − · FM depthCH 2: + · FM depth on second VCOIN AaudioOUT AaudioOUT BaudioOutaudioFMaudioFMaudio121. inverted2. positiveaudio

Behaviors

Manual offset generator IN A left unpatched

IN A normals to an internal +10V rail. Knob A now sweeps 0V to +10V, switch flipping to − flips to −10V to 0V. Channels B-D inherit this via the cascade, turning one empty ATTE into four independent manual offsets.

1-to-4 splitter with per-tap scaling signal patched to IN A only

A at IN A normals into IN B, C and D. Each channel's knob scales its own copy so one source feeds four destinations at different levels — a VCO to four filter cutoffs, or an envelope to four VCAs with independent depth.

Attenuverter per channel mode switch in − position with a signal on the input

Flipping − inverts the polarity. Knob fully down is still a precise zero, so a typical attenuverter sweep crosses zero at the left stop rather than at centre — not a bipolar pot.

Cascade break point patching IN B, C, or D

Patching any IN jack stops the normal from propagating further down. Split the four channels into 1+3, 2+2, 3+1 or 4×1 groups by choosing which jacks to insert.

Bipolar LED metering signal through any channel

Each OUT has a dual-colour LED: green for positive, red for negative. Quick visual check for polarity when patching unfamiliar modulation sources or confirming an inverter switch did what you expected.

Controls

CH 1 A Manual attenuator for channel 1. Scales signal from zero (fully left) to unity, with precise zero at the CCW end.
0 to 1× (+) or 0 to −1× (−) · linear taper
CH 2 B Manual attenuator for channel 2.
0 to 1× (+) or 0 to −1× (−) · linear taper
CH 3 C Manual attenuator for channel 3.
0 to 1× (+) or 0 to −1× (−) · linear taper
CH 4 D Manual attenuator for channel 4.
0 to 1× (+) or 0 to −1× (−) · linear taper
CH 1-4 Mode switch (+/−) Per-channel switch scaling output by +1 (attenuator) or −1 (inverter).
up (+): 0..+1 · down (−): 0..−1

I/O

IN · 4

  • IN A -10V to +10V AUDIO
    Channel 1 signal input. When unpatched, normalled to an internal +10V reference so the channel acts as a manual offset generator from 0V to ±10V.
    NORM → +10V internal reference
  • IN B -10V to +10V
    Channel 2 input. When unpatched, normalled from IN A so a signal at A splits across B, C, D until a jack breaks the chain.
    NORM → IN A signal when IN B unpatched
  • IN C -10V to +10V
    Channel 3 input. Normalled from IN B; the signal at the nearest patched jack above propagates down.
    NORM → IN B signal when IN C unpatched
  • IN D -10V to +10V
    Channel 4 input. Normalled from IN C. Patching D breaks the cascade at that point only.
    NORM → IN C signal when IN D unpatched

OUT · 4

  • OUT A -10V to +10V
    Channel 1 scaled output. LED glows green for positive signal, red for inverted/negative signal.
  • OUT B
    Channel 2 scaled output with bipolar LED indicator.
  • OUT C
    Channel 3 scaled output with bipolar LED indicator.
  • OUT D
    Channel 4 scaled output with bipolar LED indicator.