Picked up cheap an old Roland midi SD35 Player. The only floppy disks it will play are DD. I have 2 DD I purchased years ago commercially that say Karoke Midi songs. It plays those well. I believe all my old floppies are the HD floppies. I heard that if you cover the holes in the back it will make it appear to be DD, however, I think you have to reformat it and then put the midi songs on. Any old midi freaks or ideas?