Bill one other very good point about Midi file and Yamaha is that you can asign a jump point ie bridge and chorus up to 4 different one to the midi file why this is important if you do lot of dances like I do how many times in the middle of a song people get up and dance by the time they make it to the dance floor if you are using a mp3 you are screwed and then you got to re start or rewinding ect not good with a Midi file jump point areas in a song all you got to do is press a button and then you are back at a vers or a chorus ect very useful tool Psr and Tyros do this very well and Midi spot file have jump points already programed I find this to be very very useful