Hi,
Indeed, there’s a pop. It seems to be related to the fact the upper instrument has to instantaneously recover from its fade while looping. Maybe should this be considered as a bug?
A solution could be to nest the looping part (with the transition timeline inside) in another event, something like that:
The sustain point is, by the way, way more reactive than the stopping state condition.
Unfortunately, due to a bug I already reported here 2 months ago, when the nested event is playing its transition region, it plays infinitely (even when untriggered). This bug is IMO quite huge, I’m surprised it hasn’t already been fixed in the last update…
I guess this bug is linked to the fact that it’s impossible to instantly quit a transition timeline in the middle of it, as you’ve already noticed…