Sit there and look at that arranger and see if it plays. That is if you don't play a recording through it.
The point is you are certainly operating an automatic musical instrument that we know... But playing the individual accompiament style parts we're not....
I'll go out on the limb...........because anyone can do smf and a few can do style play effectively.
Give me someone from the audience and tell them to push SMF play

Put that same person in style mode .........
...isn't that the rap of this whole thread? If he was performing in style mode and really busy with changes, he'd be admired