Doepfer A-143-2 Quad ADSR
Four independent ADSRs with end-of-phase outputs, range switches, and retrigger.
26 HP Eurorack module
Doepfer's A-143-2 Quad ADSR fits four full ADSR envelope generators into a single 26 HP module. Each channel has its own Attack/Decay/Sustain/Release controls, a 3-position Range switch (low/medium/high) that selects time scaling from sub-millisecond to several minutes, a Gate input, a non-normalled Retrigger input, three digital end-of-phase outputs (EOA/EOD/EOR) for daisy-chaining and self-cycling, an envelope output (~+8 V peak), and an envelope-tracking LED. Channels 2/3/4 gates are normalled to channel 1, so a single gate at Ch1 Gate triggers all four envelopes at once when the others are unpatched.
Features
- Four independent ADSR envelope generators in one module
- 3-position Range switch per channel: low / medium / high time scaling
- Attack range: ~0.3 ms to ~2 minutes
- Decay/Release range: ~0.5 ms to ~5 minutes
- Envelope peak ~+8 V
- Three digital end-of-phase outputs per channel (EOA, EOD, EOR) — about +10 V high
- Per-channel Retrigger input (not normalled) reverses envelope direction during decay
- Channel 2/3/4 gate inputs normalled to channel 1 — one gate fires all four envelopes
- Per-channel envelope LED display
- Daisy-chain envelopes into ring patterns for cyclical modulation
- Self-patch EOD → Gate to create pseudo-LFOs
- A-100 system standard build
Controls & Jacks (48)
- Ch1 Sustain
- Ch1 Decay
- Ch1 Release
- Ch1 Attack
- Ch2 Sustain
- Ch2 Release
- Ch2 Decay
- Ch2 Attack
- Ch3 Release
- Ch3 Sustain
- Ch3 Attack
- Ch3 Decay
- Ch4 Release
- Ch4 Decay
- Ch4 Attack
- Ch4 Sustain
- Ch1 Rt
- Ch1 End of A
- Ch1 End of D
- Ch1 Gate
- Ch1 ADSR Out
- Ch1 End of R
- Ch2 End of A
- Ch2 Rt
- Ch2 End of D
- Ch2 ADSR Out
- Ch2 End of R
- Ch2 Gate
- Ch3 Rt
- Ch3 End of D
- Ch3 End of A
- Ch3 Gate
- Ch3 End of R
- Ch3 ADSR Out
- Ch4 Rt
- Ch4 End of A
- Ch4 End of D
- Ch4 Gate
- Ch4 ADSR Out
- Ch4 End of R
- Ch1 Range
- Ch2 Range
- Ch3 Range
- Ch4 Range
- Ch1 Env LED
- Ch2 Env LED
- Ch3 Env LED
- Ch4 Env LED
How-To Guides
- One ADSR per voice (four-voice patch)
- Self-cycling pseudo-LFO
- Quadrature / cyclical envelope chain
- Retriggered envelope swells
- Drum envelopes from one gate
Explore the interactive A-143-2 Quad ADSR panel on BleepDex — tap any control to learn what it does.
