Playback function for a live set-up

Hi group! I have a tricky question regarding the Quadcortex, I got it a couple months ago and I am now trying to figure a signal path to trigger playbacks in a live situation.

Basically simulate backing rhythms via pre-recorded playbacks only during my lead guitar parts. A stereo set-up would compensate when there’s no leads being played.

Would it be easier with a Looper, MIDI trigger or just routing a parallel channel for the Bass and put an octaver that pitches higher at key moments?

Keep in mind I would be playing guitar and singing as the frontman, so the less complicated for me to trigger, the better!

Thanks!