Modulators
WR-911
The WR-911 - a four-stage ADSR envelope generator with exponential time segments and both V-trig and S-trig gate inputs.
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The WR-911
The WR-911 is a four-stage envelope generator. It produces a single one-shot voltage shape with four continuously-variable times and levels: Attack (rise time), Decay (initial fall to the sustain level), Sustain (the held level while the gate stays high), and Release (final fall after the gate drops). Output is a unipolar 0 to +10 V envelope.
The WR-911 has six controls on the panel: ATTACK, DECAY, SUSTAIN, RELEASE, plus a MAN momentary trigger button and a hidden clamp shape between segments. Attack, decay, and release each cover 2 ms to 10 s on an exponential time scale - short enough to do crisp percussive transients, long enough to do slow swells. Sustain is a clean linear 0-10 V level.
Two trigger inputs are exposed. GATE is V-trig, active above 2.5 V (the standard high-on convention). S-TRIG is the legacy active-low convention - shorted to ground = trigger on - and is kept around so a patch can teach the V-trig vs S-trig distinction without leaving the engine. The two inputs OR-combine internally, and the panel MAN button fires the envelope manually for auditioning without a patched gate. All segments use exponential RC-style curves: the voltage rushes toward its target quickly at first, then eases in.
The WR-911
The WR-911 ships with six controls: ATTACK, DECAY, SUSTAIN, RELEASE, a MAN momentary button, and a S-TRIG legacy input alongside the GATE V-trig input. Attack, decay, and release each span 2 ms to 10 s on an exponential scale; sustain is a linear 0-10 V level. Curves are exponential RC-style for an organic envelope feel. Output is a unipolar 0 to +10 V shape. Both trigger inputs OR-combine internally and the manual button can fire the envelope without a patched gate.
In a patch
The WR-911 is the timing element of a typical voice patch: a WR-921 SAW into a WR-904A low-pass into a WR-902 VCA, with the WR-911 driving both the WR-904A's filter cutoff CV and the WR-902's amplitude CV at once. One envelope shapes timbre and loudness simultaneously, which is what gives the patch its bouncing feel - notes come in bright and immediately get darker as they fade.
Trigger sources flow into the WR-911's GATE input. A clock, a step sequencer, a per-column gate from a WR-960, an audio-derived V-trig from a WR-961, the panel MAN button - all fire the envelope. Multiple WR-911s in one patch is normal: one for amplitude, another for filter cutoff with a different shape, a third pitch-modulating a VCO for percussive bloops. For active-low conventions or vintage-style patching exercises, the S-TRIG input fires the same envelope from a low-going signal.
Inputs
- Gate (gate) — V-trig gate input. Signal goes high (above 2.5 V) to fire the envelope and low to release it. Patch a Clock, SEQ8 gate, Euclidean output, or any other V-trig source here.
- S-Trig (gate) — S-trig input. Active when the signal is LOW (active-low / switch-closure convention). Useful when driving from the WR-961 Interface or an S-trig source. Only fires when a cable is connected, so an unpatched S-TRIG will never false-trigger the envelope.
Outputs
- Out (cv) — Envelope output. 0 to +10 V unipolar with a 10 kΩ output impedance. Patch into any CV destination - VCA amplitude (the classic WR-911 + WR-902 pairing), filter cutoff (the 904 sweep), oscillator FM, wave-folder drive, and so on.
Controls
- T1 (Attack) — T1 - rise time (Attack). How long the envelope takes to rise from 0 to peak when the gate fires. Range is 2 ms to 10 s on an exponential scale. Shorter T1 = percussive and clicky; longer T1 = gentle swell for pads and drones.
- T2 (Decay) — T2 - initial decay time (Decay). How long it takes the envelope to fall from its peak (E_max) to the sustain level. Range is 2 ms to 10 s. Shorter T2 = snappy plucks; longer T2 = slow evolving timbres.
- ESUSTAIN (Sustain) — E_sustain (Sustain). The envelope holds at this voltage for as long as the gate is held high. Range is 0 to 10 V. 0 V = no hold (purely percussive); 10 V = organ-style with no decay; middle values = standard ADSR shapes.
- T3 (Release) — T3 - final decay time (Release). How long the envelope takes to fall from the sustain level to 0 V once the gate goes low. Range is 2 ms to 10 s. Shorter T3 = abrupt cut-off; longer T3 = long tails and ambient swells.
Synths.pw and the Classic-series modules are not affiliated with, endorsed by, or sponsored by Moog Music Inc. Module numbers reference the late-1960s American modular tradition and are used in a historical sense.
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