That's absolutely what I had in mind for the a-b looping. You just set the a-b loop points in the audio track, then enable the a-b repeat. Another way to accomplish the same thing is to set the start/end points of the track to the range you want, and then you just tap the repeat button in the audio player. Either way will work for your needs (it sounds like). If you may sometimes want to play the entire track, a-b looping is the most convenient, but if you only ever need to play a certain section of the track, the latter is probably more convenient.
Mike
Mike