Are you working on that MIDI to ORG converter?
I'm not working on a MIDI to ORG converter right now. I have only thought a tiny bit about it. Consider these differences between MIDI and ORG formats:
MIDI file: No limit on polyphony stored in the file.
ORG: One-note polyphony per track (8 melody tracks and 8 percussion tracks).
MIDI file: High time resolution, typically hundreds of divisions per beat.
ORG: Low time resolution, typically 3 to 12 divisions per beat.
MIDI file: Can change tempo, time signature, and instruments anywhere in the file.
ORG: Tempo, time signature, and instruments set once for the entire file.
Because of these differences, there's more choices you might need to make when converting a MIDI file to an ORG file. For example, if there are too many simultaneous melody notes to fit into 8 monophonic tracks, you have to choose which ones to keep. And you have to choose an appropriate time resolution for the ORG file that fits the MIDI note durations or minimizes note rounding.
If I started making a command-line MIDI to ORG converter, I'd probably end up writing a lot of instructions about how you'd have to limit certain things in the MIDI file for the conversion to work correctly. Ideally, if a lot of settings and choices are needed, a GUI program might be more friendly, but I'd have to learn some language or framework for making GUI programs.
That's as far as I've thought about a MIDI to ORG converter so far.
_____P.S. To give you a feel for how long I've been working on my ORG to MIDI converter: I started working on it in July 2009 (around the time my first post) and have been working on it intermittently since then. Looking over my archived source code, it looks like I was mostly done in October 2010, but I wanted to write about the conversion process I used and maybe clean up the source code before releasing it. So I continued occasionally drafting and revising documents about it from time to time. In June, someone on the forum asked for a MIDI version of an ORG, and I used my converter to make a MIDI version then tweaked the instruments. After I did that, it felt kind of mean to say "I've got my own ORG to MIDI converter" but not let anyone else use it. So the next weekend I did a quick check for bugs and posted the executable (above on this thread). Today, I finally posted the (still messy) source code and some documents about the ORG to MIDI conversion processes I used.