I think it would be a really useful feature to have a second press on the ‘Sync’ button put the looping envelope in to a tempo sync mode where the total duration would be quantised to the internal or external clock.
I find lots of interesting rhythmic patterns come from using the loping envelope, but then I have to either tweak it to a BPM or try and tweak the DAW to get it in sync. Kind of works, but I’d like a synced mode and I think modulating envelope times live in this mode might be interesting also.