Is it confirmed that Twin Dragon is actually missing a soundtrack, though? Simon Castles is only listed in Twin Dragon's credits as "Sound F/X", not specifying music. The original Twin Dragon readme,
the original Wylde Productions site, and
the original Level Infinity site all also do not mention the inclusion of any new music. The first mention (and, as far as I can tell, the only source) of "music by Castles Music Productions" made in relation to Twin Dragon is
this 2005 Wikipedia edit on the Shadow Warrior article. The
original Castles Music Productions site does list Twin Dragon under projects as "
Head Composer and Sound Designer", but unfortunately, it still doesn't specify that Twin Dragon received new music. For example, Secrets of the Acropolis does have new MIDI tracks, but that Quake 2 Red Rover mod doesn't have any new music. I checked
CMP_Game_Music_Demo.mp3 (more
here), but I don't have a point of reference to determine where these samples may originate from.
But speaking of missing content from the SW expansions, I was always under the impression that Wanton Destruction was missing something as well. From Charlie Wiederhold's Wanton Destruction levels readme:
Quote
The finished version had new sounds, art, anime girls, fortune cookie fortunes, and all sorts of other little things.
I was never able to find any new fortune cookie fortunes in Wanton Destruction in either the provided wanton.exe or wanton.dat.