The AU note system seems quite good. In addition to the MIDI Note number, the Note Pitch is also sent...e.g. Middle-A NoteInstanceID 65 Note Number 65.0 "NoteInstanceID" is the Midi Note number. "Note Number" is the pitch in semitones ("Pitch" would be a better name) Most of the time, it's as simple as that. Of course if the Host supports alternate tunings you may get a different Pitch mapped to that key... NoteInstanceID 65 Note Number 65.5 In this case, hitting MIDI key 65 results in a pitch halfway between A and A#. This system ties in nicely with the MIDI Tuning standard, which basically lets you tune any MIDI note number to any frequency"... http://www.midi.org/about-midi/tuning.shtml Jeff ---------------------------------------------------------------------- Generalized Music Plugin Interface (GMPI) public discussion list Participation in this list is contingent upon your abiding by the following rules: Please stay on topic. You are responsible for your own words. Please respect your fellow subscribers. Please do not redistribute anyone else's words without their permission. Archive: //www.freelists.org/archives/gmpi Email gmpi-request@xxxxxxxxxxxxx w/ subject "unsubscribe" to unsubscribe