This is just a GUESS.....But, I'm thinking that the 'lesson' midi files are coded to activate the lights....so a standard midi file (from the internet), may not light up your notes. Or, it could need to be set to a certain 'midi channel' (1 thru 16)...to work. Again these are just guesses. I would suggest trying out one of the many computer based sequencer programs, that have a 'keyboard' in the screen display. You can use the tempo control to slow down the playing, and watch the notes play on the computer screen.
I also imagine that Casio has more 'lesson' midi files avalible for download...check out their web site. Best reguards, Jim
[This message has been edited by Jim Wintringham (edited 01-18-2005).]