Hi Donny
Basically what we were referring to, biab chords and your keyboard follows it.
Didn’t watch the whole thing, but I used to have mine playing a mix of biab tracks and keyboard tracks iei I was using a country style on my pa800, I could mute the guitar track or drum track , whatever and replace it with suitable real track from biab to play instead.
Only useful for recording purposes.

No, there isn’t a demo, but they’re pretty confident in their product, they offer you a 30 day money back guarantee. I’m guessing your activation code mustn’t work after the 30 days, or maybe some sort of limitation, don’t really know, how that part works.