I was kinda bored, so I've decided to goof around a bit with original MIDI file for E1M9. Keep in mind that the recording below is not a representation of an actual soundtrack of the mod - it's just a test.
Gear and software used:
Schecter Damien C-7 Elite FR
BOSS ME-25
Sonar LE
Audacity
Let me know what you think about the tone (ignore the funny sounding midi instruments for now).