I'm not sure if the focus of your post is the music or the instrument.
This video was sponsored by Yamaha USA. As this is an 'arranger' forum, I posted it to show what one can (elevator-ish or not) do with a jazz tune in auto accomp mode. Certainly no comparison (not even close) to playin' with top flight live jazz cats, as you did so well. I really enjoyed your keyboard performance with the JazzItUp! band, especially your soloing! Second to that, its still really fun & rewarding to emulate a jazz combo on the arranger minus the 3am late hour smoke & booze. Dave, your kb's vocal scat samples sounded great but I wasn't won over by the sound of the piano sample . . . overly brittle and harsh to my ears. Which Roland piano patch did you use? btw: I still fondly remember the times we met at Namm when you were a GEM rep. Enjoyed watching you play back then, but man, it's a treat to see you 'let loose' and really shine playing with your JazzItUp! band group.