Hi Johann I've always written my own - I had code in Scheme, so one of the first things I did when learning Haskell was port it from Scheme. I haven't worked out a good way of managing channel numbers so its not on Hackage, though I could look at polishing it up this weekend if you are interested. Haskore-vintage has a MIDI file I/O within the package, but you would generally use it with the Haskore datatypes. Henning Thielemann's midi library looks quite large with lots of dependencies so I've never used it myself. Best wishes Stephen