Well, I think that it has to do with the split point. Set your split point somewhere so you can trigger the chords on lower notes and have the solos on the higher ones. Make sure you’re not on the Pianist mode. However, you will still have to manually change the chords when needed. Another way of handling this situation is using a footswitch board. With Midjay you can do that. And yet another solution, is first recording a backing track, then play it back and play whatever you want on your guitar.
Regards!