I assume the ability to fade out loops is part of the plan, but this idea is different.
A perennial problem with looping is the abruptness when switching between loops (parts in the AEROs world). When you stop recording the natural decay is lost, this can be avoided by setting it to go straight into overdub mode so the decay is added to the beginning of the loop, but this shifts the problem to the beginning of the loop. It sounds good and natural while looping, but sounds abrupt on first play (or when switched to).
Not sure if it is feasible, but thought it would be great if there was an option for like a very quick ADSR envelope, that very quickly swells the volume from silence on the first play, and quickly brings the volume down quickly before transitioning to the next part. Also if undo/redo mute/unmute worked in this way too.
I realise this is a bit of a fantasy request but I think it would make loop based music sound more natural and seamless