I finally got back to this and have posted a new version. Not much has changed, but I did tighten it up a bit (still over 7 minutes though) by the expedient of removing a section I couldn't figure out how to make work, and I put in a tempo change and tweaked the final chord. Or final unison, I guess.

The mp3 is in this directory

http://doctroid.net/Music/InterrobangCartel/AllRoads/

as are .wav files for each instrument and a .mid file in case anyone wants to mess around with them. (Note there are repeated sections which don't get repeated when you play the .mid file.) As before, if you want anything in a different format, just ask.

It'd be nice to improve the instrument sounds and add some effects, but my main tool for doing that (GarageBand) doesn't seem to be microtonal-friendly.