Delta-V

Cosmotronic 10HP
ENVELOPE LFO FUNCTION VCA SLEW

Verified sheet

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

Sources
Suggest a correction

Analog dual AD function generator in 10HP. Per channel: Attack, Decay, Shape, one-shot/LFO switch, Attack+Decay CV, dedicated VCA (5V-normalized), attenuverter, EOC. Link switch and DC-coupled SUM. Envelopes, LFOs to ~1.7kHz, ASR via SLEW, mixing.

Patch Ideas · 8

★ Two-voice AD (stereo voices in 10HP)
Each channel becomes a full voice: gate in, VCO in the VCA, OUT is the enveloped voice. Pan hard L/R for an instant stereo duo.
Walkthrough
  1. Set both Cycle switches to one-shot (envelope mode).
  2. CH 1: Attack short, Decay medium. CH 1 Attenuverter: full CW (+1× unity).
  3. CH 2: Attack short, Decay long. CH 2 Attenuverter: full CW.
  4. Patch gate source 1 → Delta-V TRIG 1.
  5. Patch gate source 2 → Delta-V TRIG 2 (keep Link switch OFF).
  6. Patch VCO 1 → Delta-V VCA 1. Patch VCO 2 → Delta-V VCA 2.
  7. Patch Delta-V OUT 1 → Output L. Patch Delta-V OUT 2 → Output R.
Signal out OUT 1 and OUT 2 — enveloped audio, one voice per channel.
Listen for Two independent plucked/sustained voices, each with its own dedicated VCA and shape. Two full monosynths in a single 10HP module.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 6 connections. Modules: Delta-V, VCO 1, VCO 2, Gate 1, Gate 2, Output. Signals: 4 audio, 2 gate.Delta-VVCO 1VCO 2Gate 1Gate 2OutputCH 1: Cycle OFF · Attack short · Decay medium · Atten full CWCH 2: Cycle OFF · Attack short · Decay long · Atten full CWLink: OFFTRIG 1gateTRIG 2gateVCA 1audioVCA 2audioOUT 1audioOUT 2audioOutaudioOutaudioOutgateOutgateIn LaudioIn Raudioaudiogate
★ Audio-rate cycling VCO
Flip CH 1 to LFO mode with very short Attack+Decay and OUT 1 becomes a low-fi AD oscillator up to about 1.7kHz. Shape morphs the waveform.
Walkthrough
  1. Set CH 1 Cycle switch to LFO.
  2. Turn CH 1 Attack fully CCW (shortest).
  3. Turn CH 1 Decay fully CCW (shortest).
  4. Set Shape to noon for a linear triangle-ish wave; CCW for exponential; CW for logarithmic.
  5. Set CH 1 Attenuverter full CW for full-level output.
  6. Unpatch anything from VCA 1 (so OUT gives raw waveform, not amplified audio).
  7. Patch Delta-V OUT 1 → Filter (In) → Output.
Signal out OUT 1 — raw AD-shaped oscillator waveform, ±10V.
Listen for A buzzy, shape-morphing tone in the audible range. Sweep Decay slowly to hear the pitch/waveform blend smoothly from sub-audio clicks up to a sustained tone.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 2 connections. Modules: Delta-V, Filter, Output. Signals: 2 audio.Delta-VFilterOutputCH 1: Cycle LFOCH 1: Attack fully CCWCH 1: Decay fully CCWCH 1 Atten: full CWOUT 1audioInaudioOutaudioInaudio11. audio-rate cyclingaudio
Gate → ASR envelope (via SLEW)
The SLEW input turns a gate into a classic attack-sustain-release envelope — rises at Attack, holds as long as the gate stays high, falls at Decay.
Walkthrough
  1. Set CH 1 Cycle switch to one-shot (envelope mode).
  2. Set CH 1 Attack to your desired rise time.
  3. Set CH 1 Decay to your desired release time.
  4. Set CH 1 Attenuverter full CW.
  5. Patch gate source (e.g. sequencer gate) → Delta-V SLEW 1 (NOT TRIG 1).
  6. Patch Delta-V OUT 1 → VCA CV (or filter cutoff).
Signal out OUT 1 — full ASR envelope (0V to +10V), follows gate length.
Listen for The envelope rises to full while the gate is high, plateaus for the gate's duration, then falls when the gate drops. Long gates give sustain; short gates give AD-like plucks.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 2 connections. Modules: Delta-V, Seq, VCA. Signals: 1 cv, 1 gate.Delta-VSeqVCACH 1: Cycle OFFCH 1: Attack = attack timeCH 1: Decay = release timeSLEW 1gateOUT 1cvGategateCVcv11. ASR via slewcvgate
Linked complex envelope (two shapes, one gate)
Link switch fires both channels from TRIG 1. Sum a fast bite + slow body into one modulation source via the SUM output.
Walkthrough
  1. Turn the Link switch ON.
  2. Set both Cycle switches to one-shot (envelope).
  3. CH 1: Attack very short, Decay short (the bite). CH 1 Atten: ~80% CW.
  4. CH 2: Attack medium, Decay long (the body). CH 2 Atten: ~60% CW.
  5. Patch single gate → Delta-V TRIG 1 only.
  6. Leave OUT 1 and OUT 2 unpatched (or monitor if you like).
  7. Patch Delta-V SUM → Filter (Cutoff).
Signal out SUM — combined two-stage envelope CV.
Listen for A filter sweep with snap up front and a slow release tail — like a two-stage envelope you'd build on DUSG or MATHS, but from a single gate.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 2 connections. Modules: Delta-V, Gate, Filter. Signals: 1 cv, 1 gate.Delta-VGateFilterLink: ONCH 1: Cycle OFF · Attack very short · Decay short · Atten ~80% CWCH 2: Cycle OFF · Attack medium · Decay long · Atten ~60% CWTRIG 1gateSUMcvOutgateCutoffcv11. bite + bodycvgate
★ Bouncing-ball envelope (self-modulated decay)
CH 1 free-runs as an LFO, and its own OUT drives its Decay CV — each cycle shortens the fall, giving the characteristic accelerating bounce.
Walkthrough
  1. Set CH 1 Cycle switch to LFO.
  2. Set CH 1 Attack fully CCW (short).
  3. Set CH 1 Decay to around 10 o'clock (medium-short) — this is the starting bounce rate.
  4. Set CH 1 Attenuverter to about 3 o'clock (positive).
  5. Unpatch VCA 1 so OUT 1 gives the raw envelope.
  6. Patch Delta-V OUT 1 → Delta-V D-CV 1 (decay CV).
  7. Patch Delta-V OUT 1 → VCA (CV) to hear it.
  8. Trim the CH 1 attenuverter: more positive = faster bounce, less = slower.
Signal out OUT 1 — accelerating envelope CV, 0 to +10V.
Listen for An envelope that gets faster and faster on each repetition until it chatters, then stalls. Back off the attenuverter and it settles into a steady LFO.
▸ Show diagram
Patch diagramPatch diagram with 2 modules and 2 connections. Modules: Delta-V, VCA. Signals: 2 cv.Delta-VVCACH 1: Cycle LFO · Attack CCW · Decay ~10 o'clock · Atten ~3 o'clockD-CV 1cvOUT 1cvCVcv11. feedback shortens decaycv
Dual drifting LFO for stereo
Both channels free-run at slightly different rates — a classic stereo chorus/pan motion source.
Walkthrough
  1. Set both Cycle switches to LFO.
  2. CH 1: Attack and Decay at ~2 o'clock (slow).
  3. CH 2: Attack and Decay slightly different from CH 1 (say ~2:30) so the two drift.
  4. Set both Attenuverters full CW.
  5. Unpatch both VCA inputs (so OUT gives raw LFO).
  6. Patch Delta-V OUT 1 → VCA L (CV).
  7. Patch Delta-V OUT 2 → VCA R (CV).
Signal out OUT 1 and OUT 2 — two drifting bipolar LFOs, ±10V.
Listen for A slow, unsynced stereo wobble — the two sides breathe against each other, never landing in phase, perfect for pad movement.
▸ Show diagram
Patch diagramPatch diagram with 3 modules and 2 connections. Modules: Delta-V, VCA L, VCA R. Signals: 2 cv.Delta-VVCA LVCA RCH 1: Cycle LFO · slowCH 2: Cycle LFO · slightly slowerOUT 1cvOUT 2cvCVcvCVcvcv
EOC ratchet (burst drums)
CH 1 in LFO mode machine-guns short pulses; each EOC fires CH 2, which plays a percussive envelope into a drum/VCA.
Walkthrough
  1. Set CH 1 Cycle switch to LFO. Attack and Decay both short (~9 o'clock).
  2. Set CH 2 Cycle switch to one-shot. CH 2 Attack very short, Decay short.
  3. Set CH 2 Attenuverter full CW.
  4. Patch gate → Delta-V TRIG 1 to start/stop bursts (optional; can leave CH 1 running).
  5. Patch Delta-V EOC 1 → Delta-V TRIG 2.
  6. Patch drum trigger / VCA CV input → Delta-V OUT 2.
  7. Tweak CH 1 Decay to change ratchet rate.
Signal out OUT 2 — percussive envelope bursts synced to CH 1's cycle rate.
Listen for Machine-gun ratcheted hits. Faster CH 1 Decay = quicker rolls; slower = tape-stop style slowdowns.
▸ Show diagram
Patch diagramPatch diagram with 2 modules and 2 connections. Modules: Delta-V, Drum. Signals: 1 cv, 1 trigger.Delta-VDrumCH 1: Cycle LFO · Attack ~9 o'clock · Decay ~9 o'clockCH 2: Cycle OFF · Attack very short · Decay short · Atten full CWTRIG 2trigEOC 1trigOUT 2cvLevelcv11. ratcheted burstscvtrigger
Two-channel DC mixer (via SUM)
With Attack and Decay at minimum and no triggers, each channel acts as a straight attenuverter — SUM becomes a 2-in DC-coupled mixer for CV or audio.
Walkthrough
  1. Set both Cycle switches to one-shot.
  2. Set CH 1 Attack and Decay fully CCW. Same for CH 2.
  3. Do NOT patch anything into TRIG 1 or TRIG 2 (channels stay idle).
  4. Patch source A → Delta-V VCA 1. Patch source B → Delta-V VCA 2.
  5. Because the envelope is at 0V when untriggered, this trick works best as a CV/audio mixer by instead patching the two sources into SLEW 1 and SLEW 2 with gates held high, OR use it on output-coupled signals — see note below.
  6. Simpler route: patch CV source A → Delta-V VCA 1 and source B → Delta-V VCA 2, then briefly hold a gate into TRIG 1+2 (Link ON) to open both envelopes to steady state; use CH 1 Atten positive and CH 2 Atten negative.
  7. Patch Delta-V SUM → Output (In).
Signal out SUM — summed / difference of the two channel outputs.
Listen for CH 1 Atten positive and CH 2 Atten negative gives A minus B at the SUM. Both positive sums them. Works cleanly on audio because SUM is DC-coupled and the attenuverters are bipolar.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 4 connections. Modules: Delta-V, Osc A, Osc B, Sustained Gate, Output. Signals: 3 audio, 1 gate.Delta-VOsc AOsc BSustained GateOutputCH 1: Cycle OFF · Attack/Decay min · Atten +70% CWCH 2: Cycle OFF · Attack/Decay min · Atten -50% (CCW)Link: ON (sustain both envelopes open)VCA 1audioVCA 2audioTRIG 1gateSUMaudioOutaudioOutaudioOutgateInaudio11. A minus Baudiogate

Behaviors

Cycle mode reaches audio rate Cycle switch set to LFO

Channel self-cycles as a continuous AD-shaped oscillator. Rate ranges from sub-Hz LFO to roughly 1.7kHz — short enough Attack+Decay turn the channel into a low-fi VCO whose waveform is bent by the Shape knob.

SLEW is an ASR converter (gate-in) Gate patched to SLEW input

The SLEW input accepts gates and shapes them with the channel's Attack and Decay times, holding the peak while the gate is high. This turns a gate into a true attack-sustain-release envelope — not a general audio slew limiter.

One jack, two roles (envelope or VCA) Patching or unpatching VCA input

Because the VCA input is normalled to +5V, OUT delivers the raw envelope/LFO when nothing is patched in. Insert audio into the VCA input and the same OUT jack becomes the amplified (enveloped) audio. Insert CV and you get an attenuated / shaped CV.

Bipolar sum mixer Both channels patched to inputs, levels set

SUM is a two-channel DC-coupled mixer via the output attenuverters. Combine two envelopes, two LFOs, or two audio signals (one inverted, one not) into a single bus.

Linked dual envelope Link switch on + single gate at TRIG 1

Both channels fire from one trigger with independent Attack/Decay/Shape. Stack two envelopes — one snappy, one slow — for layered shapes from a single gate.

EOC chaining EOC → another TRIG

End-of-cycle pulses are full triggers. EOC 1 → TRIG 2 builds sequenced bursts, ratchets, or complex LFOs where one cycle starts the next.

CV over Attack and Decay Voltage at A-CV or D-CV

Dedicated Attack and Decay CV inputs let velocity, LFOs, or even a channel's own OUT warp rise/fall times — enabling bouncing-ball decays and dynamic accents without an external attenuator.

Controls

CH 1 & 2 Attack Envelope rise time — the time for the output to climb from 0V to peak after a trigger. In Cycle mode, sets the rising slope of the LFO.
Short to long; together with Decay reaches audio rate (~1.7kHz) in Cycle mode
CH 1 & 2 Decay Envelope fall time — how long the output takes to return to 0V after the attack peak. In Cycle mode, sets the falling slope.
Short to long; very long settings give envelopes over an hour
CH 1 & 2 Shape Bends the slope curve of both attack and decay stages.
CCW: exponential · noon: linear · CW: logarithmic
CH 1 & 2 Output Attenuverter Scales and optionally inverts the channel output. Sets envelope/LFO amplitude at OUT, and also sets this channel's contribution to the SUM bus.
-1× at full CCW · 0 at noon · +1× at full CW
CH 1 & 2 Cycle Switch (One-shot / LFO) Toggles between one-shot AD envelope (triggered by gate) and free-running LFO. In LFO mode the channel self-cycles; Attack+Decay set the waveshape and rate, and Trig still resets the cycle if patched.
One-shot (envelope) · LFO (self-cycling, up to ~1.7kHz)
Global Trigger Link Switch Normals TRIG 1 to TRIG 2 so both channels fire from a single gate patched into TRIG 1. Turn off to drive each channel from its own trigger.
On: CH 1 Trig drives CH 2 · Off: independent

I/O

IN · 5

  • TRIG 1 / TRIG 2 2V+ gate GATE
    Gate/trigger input per channel — starts the AD envelope or resets the LFO cycle.
    NORM → TRIG 2 is normalled from TRIG 1 when Link switch is on
  • SLEW 1 / SLEW 2 gate-level GATE
    Gate input that is slewed by the Attack and Decay times — creates a classic ASR envelope: rises at Attack rate while the gate is high, holds as long as the gate stays high, falls at Decay rate when the gate drops.
  • A-CV 1 / A-CV 2 ENV
    CV input for Attack time — modulate rise rate with an LFO, envelope, or sequencer.
  • D-CV 1 / D-CV 2 ENV
    CV input for Decay time — modulate fall rate, useful for dynamic / accelerating envelope shapes.
  • VCA 1 / VCA 2 ENV
    Audio or CV input to the per-channel internal VCA. The channel output becomes this signal amplified by the envelope/LFO. Normalled to +5V when unpatched, which is why OUT produces the raw envelope when nothing is plugged in.
    NORM → +5V internal when unpatched

OUT · 3

  • OUT 1 / OUT 2 ±10V via attenuverter ENV
    Single channel output per channel. With nothing in the VCA input: raw envelope/LFO at the level set by the attenuverter (±10V). With audio in the VCA input: that audio amplified by the envelope/LFO. With CV in the VCA input: envelope amplitude scaled by that CV (accents, dynamics).
  • EOC 1 / EOC 2 GATE
    End-of-cycle trigger — pulses at the end of every decay stage (envelope or LFO mode). Handy for chaining envelopes or as a clock tap from an LFO.
  • SUM CV
    DC-coupled mix of OUT 1 + OUT 2 via their output attenuverters. Usable with audio or CV — two-channel mixer or summed modulator.