"k25 series” 2.5cm Kosmo Utilities

Did you or @MacMannes ever resolve this? I breadboarded the Schmitz “Fastest Envelope in the West” today and it similarly doesn’t return to 0 V, I tried adding the diode and 100k resistor and that made it get back to 0 V or at least a lot closer. Downside is it reduces the amplitude of the envelope a little including the sustain level, but maybe that’s acceptable.

Blue = before diode, yellow = after.

I’m surprised you didn’t see better results, but maybe something else is going on.

I’ve just now found Kassutronics’ solution to the problem (with the Schmitz ADSR), it’s interesting:

This design takes it further, getting rid of the remaining ~20 mV using a MOSFET switch, but that’s probably more trouble than I’d find it’s worth.

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