Currently, it appears you are only able to play loops that were recorded within the same track.
Allow the ability to play loops from other tracks by selecting their unique name.
This could be advantageous for vocal harmony tracks for example. Record the original lead vocal phrase. In a separate track, loop that same original phrase but pitch shift it and add different EQ, reverb and volume settings to place the backing vocals behind but supporting the lead vocal; all from the same lead vocal phrase.