not sure if this is a bug or intentional.
when you save a preset for the Instrument Envelope (i tried with Volume), the sustain setting does not get saved with it. try it for yourself:
- instrument 1, instrument envelope (whichever) on, set a sustain value, right-click Preset 1 to save.
- instrument 2, same as above, but left-click Preset 1 to recall.
as you can see, all other settings are saved except for the sustain on/off + sustain position.
strangely, it does seem to work within the same instrument. so that’s why i’m guessing it’s a bug.