Rolman,

not sure i understand your question,

but we are talking about arranger performance, meaning changing chords with left hand and it follows your chord changes, so you can play a song or a chain of songs, any way you feel like for as long as you want...

playing an mp3/wav is just that, it plays the song like it is, and is always same length, and always sounds same,

playing/mp3 wave has nothing to do with this topic of how Audya handles guitar track in Real Time, real-time chord changes