I decided to try making a full-length song in FL Studio using only the pattern sequencer and playlist stuff... i.e. without my keyboard.  Digital Worlds was the result.  I think it turned out very nicely, especially considering this was my first try at "writing" music instead of simply performing it.
It would work nicely for a Descent 3 level because I could easily split it into regions due to the way I made it.  Maybe IceFactor.