Hi, thanks for the question! Loopable tracks is a good suggestion, I can see that being useful especially for showing off looping background music.
There’s a lot to think about for the first request to make it clear to the user what’s happening. Looping a track continuously would be fairly simple, it would just mean requiring the user to skip/click on the next track in order to continue the playlist. With a set number of loops I think there should be a counter somewhere, and there would have to be a decision made about what actions cause the counter to reset. A looping region is more complicated to support, but a lot of the ui I made for the preview region could be reused for this.
For the second request, I could see a solution where the play button switches to a loop-play button maybe by holding shift or long-pressing for mobile, or alternatively with a toggle switch somewhere near the top.
Let me know if you have any immediate thoughts, either way I’ll look into implementing some part of this soon!