Issue #80 resolved
Currently this is possible for example by:
- Duplicating the Playtime track
- Saving the current Playtime setup as a preset and loading it in another Playtime instance (essentially the same as 1)
- Filling a slot of Playtime instance 2 with an item that is already used in Playtime instance 1
This introduces weird behavior such as disappearing clips and strange playback behavior (makes sense).