So I think I may have found an acceptable way to write music and produce a midi file of the score using Lilypond.  However, the midi output of Lilypond leaves quite a bit to be desired.

Does anyone know of a decent, preferably free open source OS X native, midi editor out there that will allow me to endlessly tweak the midi file output from Lilypond?  Of course, this way I will guarantee that I will spend all my time making the pieces “perfect” and never producing anything, but I just can’t help myself.