Tunda

Malstrom 2HP
UTILITY MIXER MULT ATTENUATOR

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2HP cascaded buffer system with four normalled stages plus an averaged sum out. One module covers buffered mult, precision mixer, 2:2 split, attenuator and amplifier duties for audio and CV — linkable with more Tundas for longer chains.

Patch Ideas · 4

Buffered V/Oct fan-out to four VCOs
One sequencer CV drives four oscillators in tune via the cascade normalling.
Walkthrough
  1. Patch Sequencer (Pitch CV) into Tunda IN 1.
  2. Leave IN 2, IN 3 and IN 4 empty — the normal copies IN 1 down the chain.
  3. Patch Tunda OUT 1 into VCO 1 V/Oct.
  4. Patch Tunda OUT 2 into VCO 2 V/Oct.
  5. Patch Tunda OUT 3 into VCO 3 V/Oct.
  6. Patch Tunda OUT 4 into VCO 4 V/Oct.
  7. Detune each VCO by ear — the pitch CV itself stays identical across all four.
Signal out Tunda OUT 1–4 — four buffered copies of the same V/Oct, no tuning droop.
Listen for Four oscillators tracking in perfect unison across the keyboard. Detune by cents at each VCO for a thick supersaw/chorus stack without pitch drift as you add more voices.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Tunda, Sequencer, VCO 1, VCO 2, VCO 3, VCO 4. Signals: 5 pitch.TundaSequencerVCO 1VCO 2VCO 3VCO 4In 11v/octOut 11v/octOut 21v/octOut 31v/octOut 41v/octPitch1v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octV/Oct1v/octpitch
Safe 4-voice summing mixer
Average Out sums four voices with built-in divide-by-4 so the bus stays inside ±10V.
Walkthrough
  1. Patch Voice 1 OUT into Tunda IN 1.
  2. Patch Voice 2 OUT into Tunda IN 2.
  3. Patch Voice 3 OUT into Tunda IN 3.
  4. Patch Voice 4 OUT into Tunda IN 4.
  5. Patch Tunda AVERAGE OUT into your main output / recorder input.
  6. If a voice sounds too quiet in the mix, boost it at its source — Tunda keeps the gain structure exact, it doesn't have per-channel pots.
Signal out Tunda AVERAGE OUT — the four voices combined at 0.25x each, staying clipless.
Listen for A clean, balanced four-voice sum. Level stays controlled no matter how loud the inputs are — trade per-channel volume control for guaranteed headroom.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 5 connections. Modules: Tunda, Output, Voice 1, Voice 2, Voice 3, Voice 4. Signals: 5 audio.TundaOutputVoice 1Voice 2Voice 3Voice 4In 1audioIn 2audioIn 3audioIn 4audioAverage OutaudioInaudioOutaudioOutaudioOutaudioOutaudioaudio
Precision CV scaler (0.5x attenuator)
Cut any CV in half cleanly using Average Out with two copies of the same signal.
Walkthrough
  1. Patch your source CV (e.g. an LFO) into Tunda IN 1.
  2. Mult the same source and patch it into Tunda IN 2 as well.
  3. Leave IN 3 and IN 4 empty.
  4. Patch Tunda AVERAGE OUT into the destination (e.g. filter cutoff).
  5. The destination now sees exactly 0.5x the source — add a third copy into IN 3 for 0.75x, or use one copy alone for 0.25x.
Signal out Tunda AVERAGE OUT — calibrated fraction of the source (0.25 / 0.5 / 0.75 / 1.0).
Listen for The modulation destination moves by a precise, repeatable fraction of the source. No pot wobble — useful for dialing in exact transposition amounts or matching two modulation depths.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 3 connections. Modules: Tunda, LFO, Filter. Signals: 2 audio, 1 cv.TundaLFOFilterIn 1audioIn 2audioAverage OutcvOutaudioCutoffcv11. duplicate for 0.5xaudiocv
2:2 split — two independent buffered branches
One Tunda acts as two separate stereo-style buffered mults in 2HP.
Walkthrough
  1. Patch Source A (e.g. a pitch CV) into Tunda IN 1 — leave IN 2 empty so the normal carries A into stage 2.
  2. Patch Source B (e.g. an LFO) into Tunda IN 3 — this breaks the chain at stage 3.
  3. Take Tunda OUT 1 and OUT 2 as two buffered copies of Source A.
  4. Take Tunda OUT 3 and OUT 4 as two buffered copies of Source B.
  5. AVERAGE OUT is still live — it will output the average of A, A, B, B (= 0.5·A + 0.5·B) if you want a bonus combined signal.
Signal out OUT 1–2 = Source A (x2 copies). OUT 3–4 = Source B (x2 copies).
Listen for Two completely independent buffered pairs. Great for sending one pitch CV to two oscillators while simultaneously sending one LFO to two filters — no crosstalk between the pairs.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 3 cv, 3 pitch.TundaPitch CVLFOVCO 1VCO 2Filter 1Filter 2In 11v/octIn 3cvOut 11v/octOut 21v/octOut 3cvOut 4cvOut1v/octOutcvV/Oct1v/octV/Oct1v/octCutoffcvCutoffcv11. breaks the chaincvpitch

Behaviors

Cascade normalling patch into a later input to break the chain

The four stages are normalled together top-to-bottom. Plugging into In 2/3/4 breaks the normal at that point, which is what lets a single module reshape between mult, mix and split roles without a switch.

1:4 buffered mult one source into In 1, leave In 2/3/4 empty

Out 1–4 all carry a buffered copy of In 1. No sag on V/Oct, no loading when driving many destinations.

4:1 precision sum four sources into In 1–4, take Out 4

Out 4 is the running sum of all four stages. Useful when you want the full combined level; use Average Out instead if you need to stay inside ±10V.

2:2 split source A into In 1, source B into In 3

Out 1–2 carry source A (B is blocked at stage 3's break), Out 3–4 carry source B. Two independent buffered pairs in 2HP.

Precision gain x2 / x3 / x4 duplicate one source across consecutive inputs and take the last used Out

Copy In 1 into In 2 (and 3, 4) to get 2x, 3x or 4x gain at Out 2/3/4 — handy for scaling a 1V/oct bus to higher octaves or boosting quiet CV.

Precision attenuation 0.75 / 0.5 / 0.25 feed one source, take Average Out with 1–4 stages engaged

Average Out divides by 4. Combine with empty stages or identical sources to land on 0.25x, 0.5x, 0.75x or 1x scaling — clean, calibrated CV attenuation with no pots to drift.

Chainable patch Out 4 of one Tunda into In 1 of another

Cascade keeps going across modules — two Tundas give you an 8-stage buffered chain, three give you 12, etc.

Controls

I/O

IN · 4

  • In 1 audio / CV, ±10V CV
    First stage input. Head of the cascade — whatever goes here shows up on Out 1 and, via normalling, is summed into every stage below it unless you break the chain by plugging into a later input.
  • In 2 audio / CV, ±10V CV
    Second stage input. Normalled to the first stage so Out 2 carries In 1 + In 2. Plugging here breaks the normal from In 1 for stages 2–4.
  • In 3 audio / CV, ±10V CV
    Third stage input. Normalled from above; patching here breaks the chain at stage 3.
  • In 4 audio / CV, ±10V CV
    Fourth stage input. Normalled from above. Patching here breaks the chain at the last stage.

OUT · 5

  • Out 1 audio / CV, ±10V CV
    Buffered tap after stage 1. Use it as a clean copy of In 1 or as the head of a buffered mult chain.
  • Out 2 audio / CV, ±10V CV
    Buffered tap after stage 2. If In 2 is empty this mirrors Out 1; otherwise it carries the running sum of stages 1–2.
  • Out 3 audio / CV, ±10V CV
    Buffered tap after stage 3. Either a mult copy of the upstream signal or a running sum of stages 1–3, depending on what's patched.
  • Out 4 audio / CV, ±10V CV
    Buffered tap after stage 4. With all four inputs patched this is the full 4:1 sum (precision x2/x3/x4 amp when fewer duplicates are used).
  • Average Out audio / CV, ±10V CV
    Averaged sum of the four stages — divides the combined level back down so a 4:1 mix stays inside ±10V without clipping. Great for CV averaging and safe voice summing.