I have been using anvil studio to edit midi files to make them work with my casio lk 300( IE: piano tracks 3&4 ) if anyone else has some good ones that is nice piano melody's I would love to give them a try here is a link h**p://pastebin.com/mfGyqJLd for a few I have edited if you like these just ask I have loads more! some of these work on right or left channel only! others work on both! play around with them! and if anyone can make them better that would be great! either use casio smf converter or just copy them to your SD card!