Stim, technically I didn't edit the MIDI. What I did was open it in a NoteWorthy file and then edited the score. When I was satisfied with my edits, I exported it to a new MIDI file. One thing I like about NWC is that it gives me more editing functions for MIDI output than most other score editors I've used, including Finale. One of those I use often is the ability to set the velocity and panning for an individual staff.