Part of #2 Blocked by: #16
While in a room, each Groove player's patch document follows it, so quitting or crashing loses nothing. When the room ends, the creator carries on from theirs, and a guest's is their own copy, a credited fork if they publish it (ADR 0007, ADR 0019).
A room that ended with its creator away left a draft on atmosynth.at: opening that patch document brings it in as one undoable edit. Needs atmosynth.at to let a creator read that draft from Groove.