CEMvelope is based on the legendary ADSR section of the Sequential Circuits Pro-One monosynth, with minor adaptations to integrate it into Euro format. Smooth and snappy!
It has a gate input as well as a trigger input, the trigger input works in conjunction with the gate input for multiple triggering from a suitable controller device. CEMvelope has at it’s heart a CEM3310 or AS3310. You can source your own chip, of buy direct from me when you order your PCB set and panel.