About This File
This is kind of a cheesy attempt, but it was more to prove to myself that I could program something like this with the arpeggiator. First time around, it took about 30-45 minutes from inception to me uploading this.
This "auto-accompaniment" for the PX-5S in a walking bass style. The lowest octave is reserved for drums, the next two octaves for bass and brass. Because the PX-5S is not an accompaniment keyboard, it won't figure out the chord roots, so you'll have to play them in root position. It uses the arpeggiator for the walking bassline and for the brass hits, and a phrase for the drumset (in slot 103). The rest of the keyboard is open to the piano.