i also made a qt midi file in a program i downloaded last week called midigraphy.
it is a great program, letting you sequence music and it plays it back in quicktime midi musical, instruments.
i'm not a musician but i composed five bars of music randomly clicking on various tracks.
the music was made as a quicktime file and then processed in movieplayer to make it cross-platform .mov file.
this produced a 1k file-great, as long as you have qt musical instruments extension and qt plugin for netscape, which will be standard in the next public release version of netscape.