The Sanford ADSR Envelope generates MIDI Control Change messages following the amplitude of the envelope 12/08/09
Here's what Sanford has to say about the Sanford ADSR Envelope:
The Sanford ADSR Envelope is a faithful implementation of the classic ADSR envelope. Connect it to a plug-in capable of receiving MIDI controller change messages, and it's as if you've given it an extra ADSR envelope.
Generates MIDI Control Change messages: Messages follow the amplitude of the envelope
Key tracking: You can adjust higher notes to decay more rapidly
Velocity sensitivity: Reponds to how hard you play
Legato mode: Legato and Retrigger modes supported
MIDI Learn for every parameter: All parameters can be automated
Pricing and Availability:
The Sanford ADSR Envelope is $15.00 USD.