333

Frap Tools 6HP
MIXER UTILITY MULT BUFFER

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Three-section analog summing and distribution utility. Each section sums three DC-coupled inputs into three buffered outputs, with optional -6 dB attenuation. Semi-normalled chain lets it act as 1-to-9 mult or 7-to-1 mixer.

Patch Ideas · 5

★ 9-way pitch mult
Patch sequencer V/oct into Red IN 1 · leave Yellow IN 1 and Green IN 1 unpatched so the cascade propagates · all nine outputs carry the same pitch CV, each buffered independently · distribute to nine oscillators without degrading tracking.
▸ Show diagram
Patch diagramPatch diagram with 14 modules and 10 connections. Signals: 10 pitch.333SequencerRedVCO 1VCO 2VCO 3YellowVCO 4VCO 5VCO 6GreenVCO 7VCO 8VCO 9All -6 dB: offYellow IN 1, Green IN 1: unpatched (cascade active)V/oct1v/octIN 11v/octOUT 11v/octOUT 21v/octOUT 31v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octOUT 11v/octOUT 21v/octOUT 31v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octOUT 11v/octOUT 21v/octOUT 31v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octpitch
★ 7-to-1 sum
Seven signals into Red IN 1-3, Yellow IN 2-3, Green IN 2-3 · cascade carries Red's sum into Yellow IN 1 and Yellow's sum into Green IN 1 · Green OUT is the running total · engage -6 dB per section as needed to keep the sum inside ±10 V.
▸ Show diagram
Patch diagramPatch diagram with 12 modules and 8 connections. Signals: 8 audio.333Source 1RedSource 2Source 3Source 4YellowSource 5Source 6GreenSource 7OutputYellow IN 1, Green IN 1: unpatched-6 dB: per section as neededOutaudioIN 1audioIN 2audioIN 3audioOutaudioOutaudioOutaudioIN 2audioIN 3audioOutaudioOutaudioIN 2audioIN 3audioOUT 1audioOutaudioInaudioaudio
Clock merger
Three clocks from different dividers into Red IN 1-3 · Red OUT 1/2/3 deliver the merged pulse stream (OR-like via summing) to three destinations · DC coupling passes every rising edge cleanly.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 6 clock.Clock ARedClock BClock CDrum 1Drum 2Drum 3OutclkIN 1clkIN 2clkIN 3clkOUT 1clkOUT 2clkOUT 3clkOutclkOutclkTrigclkTrigclkTrigclkclock
★ CV sum with headroom
Three LFOs summed into one composite modulation · all three into one section, -6 dB engaged so the triple-summed signal sits inside ±5 V · three buffered copies delivered to three targets at the same amplitude.
▸ Show diagram
Patch diagramPatch diagram with 8 modules and 6 connections. Signals: 6 cv.333LFO 1YellowLFO 2LFO 3FilterVCAFXYellow -6 dB: ONOutcvIN 1cvIN 2cvIN 3cvOUT 1cvOUT 2cvOUT 3cvOutcvOutcvCutoffcvCVcvTime CVcvcv
Three separate 3→3 groups
Break the semi-normal by patching Yellow IN 1 and Green IN 1 with real signals · 333 now behaves as three independent 3-in 3-out mixer-mults · red handles one voice, yellow another, green a third — one module, three utility channels.
▸ Show diagram
Patch diagramPatch diagram with 13 modules and 9 connections. Signals: 9 audio.333Red Src 1RedRed Src 2Red Src 3Yellow Src 1YellowYellow Src 2Yellow Src 3Green Src 1GreenGreen Src 2Green Src 3Semi-normal broken: Yellow IN 1 and Green IN 1 patchedOutaudioIN 1audioIN 2audioIN 3audioOutaudioOutaudioOutaudioIN 1audioIN 2audioIN 3audioOutaudioOutaudioOutaudioIN 1audioIN 2audioIN 3audioOutaudioOutaudioaudio

Behaviors

Three isolated summing amps patch inputs to any section

Each of the red, yellow, green sections is a 3-in 3-out buffered summing amp. No cross-talk between sections unless the semi-normal is exploited — sections operate independently otherwise.

Cascading semi-normal leave Yellow IN 1 / Green IN 1 unpatched

Red's post-switch sum feeds Yellow's first input; Yellow's post-switch sum feeds Green's first input. Stacking this way turns 333 into a 1-to-9 mult (patch into Red IN 1, take 9 outs) or a 7-to-1 summing mixer (fill Red IN 1-3, Yellow IN 2-3, Green IN 2-3, take Green OUT).

DC-coupled throughout any CV/clock at the input

Entire signal path is DC-coupled. Safe for pitch CV, envelopes, triggers, and gates — no droop, no coupling capacitor. Buffered outputs preserve 1 V/oct tracking when multing pitch.

-6 dB pad placement flip -6 dB switch

Attenuation occurs after the summing amplifier, before the output buffers. Scales the whole section sum by 0.5, useful when summing three ±5 V modular-level signals that would otherwise clip downstream.

Controls

Red / Yellow / Green sections -6 dB Switch Halves the post-sum signal for hot inputs.
up: unity · down: -6 dB · one per section

I/O

IN · 1

  • Section Inputs (3 per section × 3) bipolar, full modular range CLK
    DC-coupled summing inputs. Accepts audio, CV, clock.
    NORM → Yellow IN 1 ← Red post-switch sum; Green IN 1 ← Yellow post-switch sum (semi-normalled chain)

OUT · 1

  • Section Outputs (3 per section × 3) bipolar, after -6 dB switch
    Three independently buffered copies of the section sum.