He has mixed it up so well
I think the first part and majority of the second part seems arranger playing. Its only in the last 15 mins or so .. the SMF and MP3 come into play.
Some of the sounds are good to great. But the sax could have been better; I think too much of tinkering with the joystick can actually make it sound fake !! The bass and drums.. hard to beat the details in even a MOTL Roland.
The guy demonstrating is so fluent with the keys,button pushes etc. And the registrations I guess he has plenty of them in the USB. Great performance !!