A-140-2 Dual Mini ADSR

Doepfer 8HP
ENVELOPE FUNCTION UTILITY

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Dual ADSR envelope generator with retrigger inputs, a shared CV time input per channel, and jumper-selectable normal/inverted second outputs. Gate 1 can be normalled to Gate 2.

Patch Ideas · 5

★ Paired VCA envelopes
Gate 1 from keyboard or sequencer drives both ADSRs via the normalled gate bus; Output 1 opens a VCA, Output 4 opens a second voice, and the inverted output shapes a complementary filter envelope. The two voices stay locked but move differently.
▸ Show diagram
Patch diagramPatch diagram with 8 modules and 10 connections. Signals: 4 audio, 3 cv, 2 pitch, 1 gate.A-140-2 Dual Mini ADSRKeyboardVCA 1VCA 2VCO 1VCO 2FilterMixerGate 1 -> Gate 2 normalled: Output 2 = inverted: Gate 1gateOutput 1cvOutput 4cvOutput 2cvGategatePitch1v/octCVcvInaudioOutaudioCVcvInaudioOutaudioV/Oct1v/octOutaudioV/Oct1v/octOutaudioCutoffcvIn 1audioIn 2audioaudiocvpitchgate
★ Retrig percussion
A short gate opens the first ADSR, and a faster trigger train into Retrig 1 restarts the decay while the note is still held. The result is a single envelope that can spit ratcheted accents without extra logic.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 7 connections. Signals: 2 audio, 3 cv, 1 gate, 1 trigger.A-140-2 Dual Mini ADSRClockEnvelopeVCAKeyboardNoiseOutputTime Range: MGate 1gateRetrig 1trigOutput 1cvOuttrigTrigcvOutcvCVcvInaudioOutaudioGategateOutaudioInaudioaudiocvgatetrigger
★ Slow dual contour
CVT is jumpered to A, D, and R on both channels, with the attenuator set low and the time range on H. A slow LFO into CVT lengthens and shortens both envelopes together for long drone swells and fades.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 2 audio, 4 cv.A-140-2 Dual Mini ADSRLFOVCOFilterVCAFilter (In) -> VCAOutputTime Range: HCVT affects: A+D+RCVT 1cvCVT 2cvOutput 1cvOutput 4cvOutcvOutaudioCutoffcvCVcvOutaudioInaudioInaudioaudiocv
Inverted filter pair
Output 1 drives the amp while Output 2, set inverted by jumper, drives the filter cutoff in the opposite direction. The same gate creates a louder note with a closing filter sweep instead of the usual opening sweep.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 6 connections. Signals: 2 audio, 2 cv, 1 pitch, 1 gate.A-140-2 Dual Mini ADSRVCOFilterVCASequencerFilter (In) -> VCAOutputOutput 2 = inverted: Gate 1gateOutput 1cvOutput 2cvV/Oct1v/octOutaudioCutoffcvCVcvOutaudioGategatePitch1v/octInaudioInaudioaudiocvpitchgate
Manual dual pulse
A fingered gate into Gate 2 leaves envelope 1 free for the main note while envelope 2 is used as a manual accent or percussion contour. The two ADSRs can run with the same trigger source or with separate timings for call-and-response patches.
▸ Show diagram
Patch diagramPatch diagram with 7 modules and 7 connections. Signals: 2 audio, 3 cv, 2 gate.A-140-2 Dual Mini ADSRClockButtonVCOVCAEnvelopeOutputGate 1 -> Gate 2 normalled off: Gate 1gateGate 2gateOutput 1cvOutput 3cvOutgateGategateOutaudioCVcvInaudioOutaudioTrigcvOutcvInaudioaudiocvgate

Behaviors

Gate bus normalisation Gate 1 -> Gate 2 jumper installed

Gate 1 also starts envelope 2. That makes the module behave like a paired dual ADSR until the jumper is removed.

Retrigger while open pulse Retrig while Gate stays high

The current envelope restarts without needing a new gate low-high cycle. Useful for ratchets and repeated accents.

Time CV routing by jumper CVT jumper configuration

Internal jumpers decide whether CVT acts on A, D, S, R, and whether rising CV shortens or stretches those stages.

Inverted second output Output 2 polarity jumper

The second output can be normal or inverted, which is convenient for paired VCA/filter movement from one envelope source.

Bus gate access rear bus jumper installed

The module can receive gate from the A-100 bus instead of only the front-panel gate jack.

Controls

ADSR 1 / ADSR 2 Attack Sets rise time for the envelope.
1ms to 30s-ish depending on range
ADSR 1 / ADSR 2 Decay Sets fall from attack peak to sustain level.
1ms to 30s-ish depending on range
ADSR 1 / ADSR 2 Sustain Sets sustain level while gate stays high.
0V to full level
ADSR 1 / ADSR 2 Release Sets fall time after gate closes.
1ms to 30s-ish depending on range
ADSR 1 / ADSR 2 CVT Attenuator Scales the time-control voltage input.
bipolar via internal jumpers
ADSR 1 / ADSR 2 LED Displays envelope activity.
follows envelope voltage
Global Time Range Selects the attack/decay/release time range.
H / L / M

I/O

IN · 6

  • Gate 1 +5V to +12V gate GATE
    Gate input for envelope 1.
  • Retrig 1 +5V to +12V trigger GATE
    Retriggers envelope 1 while gate remains high.
  • CVT 1 0V to +10V ENV
    Time-control voltage for envelope 1.
  • Gate 2 +5V to +12V gate GATE
    Gate input for envelope 2. Can be normalled from Gate 1 by jumper.
  • Retrig 2 +5V to +12V trigger GATE
    Retriggers envelope 2 while gate remains high.
  • CVT 2 0V to +10V ENV
    Time-control voltage for envelope 2.

OUT · 4

  • Output 1 0V to 10V ENV
    Normal envelope output for envelope 1.
  • Output 2 0V to 10V ENV
    Normal or inverted envelope output for envelope 1, selected by jumper.
  • Output 3 0V to 10V ENV
    Normal envelope output for envelope 2.
  • Output 4 0V to 10V ENV
    Normal or inverted envelope output for envelope 2, selected by jumper.