MOTM

>   The envelope starts and ends at the initial level.  On a gate, the
>envelope slopes to attack level atthe attack rate, decays to sustain
>level at the decay rate, stays at sustain level until gate off, then
>releases back to initial level at the release rate.

See?? I knew it was a stupid question :)

>   I will replace -OUT with TRIG IN.

Cool :)

>A trigger would just do the attack and release portions.

That would work with a drum controller.  Since the logic is done with 
a PIC, it shouldn't be too hard to program it to respond to gates and 
triggers just like the MOTM-800.

>  > Imho, it doesn't need a pushbutton or a negative out.
>
>   Lots of folks want a pushbutton, so I plan to include one.

Then that's probably the right thing to do.