This module is used and has been fully tested
The Pittsburgh Modular Envelope is a complex multi-stage envelope generator with voltage controllable attack and decay/release. Using the sustain switch to toggle between modes, the Envelope functions as either a 2 stage attack-decay envelope or a 3 stage attack-sustain-release envelope.
The Envelope response for attack and decay/release is continually adjustable between logarithmic, linear, and exponential allowing for precision envelope shaping. Cycle times range from .8ms or 1250Hz at the shortest to at the longest.
This module is incredibly versatile. It can perform as voltage controlled envelope generator, voltage controlled portamento, envelope follower, VCO, and voltage controlled LFO, pulse delay, and wave shaper.