Available as an assembled Module and as a DIY project.
This Module is currently available.
4HP ADSR Module
This is a classic envelope generator, based on AS3310, a clone of the CEM3310. Features a separate trigger input, normal and inverse envelope output, high quality components and careful engineering.
Attack, Decay and Release times vary exponentially with the control knob. This module can produce very fast envelopes, with A/D/R time varying between 2 ms and 4 seconds.
When the TRIGGER input is unconnected, rising and falling edges of the GATE input will trigger a classic ADSR envelope.
If the TRIGGER input is connected, a high GATE level will bring the output to SUSTAIN level, and the GATE falling edge will start the release phase. A TRIGGER input when GATE is high will start an attack/decay cycle.
This is the second version of the ADSR. The previous version, MRG 3310 ADSR, is sold out. Although the module has been completely redesigned, the only visible change from the previous module is the knob orientation.