Envelope looping

[unfa]

This would allow using envelopes as custom-shaped LFOs, making some cool new sounds possible.

Right now in the Envelope Free Mode we have a Sustain point.

If we could also select another "Loop" point - the Envelope could then repeat between Sustain and Loop when the note is held:

[friedolino78]

not the full thing but since b3f81ce3b6a01d596412b59ff404c3f1feff5d96 ENVs are repeatable but using the sustain point and no pingpong