Question When recording a new track, what's the difference between setting the loop with the record icon, the play icon, and the stop icon

Setting a loop with the record icon sets the loop and turns recording off so your loop plays as expected.  Setting a loop with the play icon sets the loop but leaves recording enabled (overdubbing) which means you can immediately begin overdubbing to your new loop.  Setting the loop with the stop icon will set and stop your loop.