I’ll let the performer explain what’s going on here:
I think this is a hilarious patch on the Roland 700SX. It is called “Jazz Scat” on the Roland 700SX stage piano. There are four velocity layers: “doo, bop, dit, and dow” which play on each note according to how hard you hit the keys. The patch has a happy vibe, so I thought it went well with Route 66.
It’s also a patch that could wear out its welcome really quick. But this video shows how much mileage a good musician can get out of it.