I run Cakewalk 4.0 for DOS on my 100LX. (Cakewalk is MIDI sequencing software that lets you record, edit and play back music through a MIDI-interfaced instrument.) I have a 20 MB double flash card that I use to store Cakewalk and all of the files. I use the Key MS124 Midiator pocket MIDI box that connects through the HP serial cable. The speed is fine for smaller to medium arrangements, but on some larger MIDI files the timing is not quite right. The 100LX is great to PLAY MIDI files on, but I wouldn't want to use it to EDIT MIDI files.
Brian McCarty
CompuServe ID: [75121,2130]