Found something that might help
Hang On.. I found this which might help a little.
it is from unrealized.com
Not an absolute solution, but it's something. Unfortunatly it appears you can only associate a song with a map. Damn.
Put WAV Music Into UMX (Music) by Angus
Here is how I got wav files into UT.
Update: See below.
Download modplug player from
http://www.modplug.com and install.
Press Open and select WAV files from the file types.
Browse to the WAV file you wish to include in UT and open it within mod player.
Select Save As: Impulse Tracker modules (.IT). Save file.
Open your UT editor. On the right hand side is a grey column with heading "Browse". By default Music should be selected.
Then at the bottom of the grey Browse colomn select Import. Browse to the file you just saved as an IT. After you import it it should appear in the column. Highlight the file. Select Save. It should prompt you to save it as a UMX file.
Now what you have to do is find out what music track is associated with which map.
For example "Peak" (deathmatch) uses Razor-ub.umx. Move this file somewhere else then re-name your recently created UMX file Razor-ub.umx. Drag this file to the Music directory. Now when you play the "Peak" map the music will be whatever wav file you originally started with.
But take note:
UT will have trouble playing a large file. I tried it with a 44MB file and it simply would not work. I then used easy cdda extractor to compress it down to 1.4MB and it worked fine, but the sound quality was shocking. I can only suggest raising the quality of the wav file in a trial & error fashion. Hope this helps.
Update: Just an update to importing WAV files in UT. Let me be clear it DID work when I did it the first time. It played the music file no problems
but when I tried to do it again in exactly the same way as I previously described with a different song. It just would not work and I can't for the life of me figure out why. I then tried with original song and again it didn't work. I'll be working on this and as soon as to figure out whats going on I'll let you know. So please don't email me telling me it doesn't work. Apologies to all those who have tried in vain to get their favorite songs into UT using my method and failed. It CAN be done. As soon as I have the solution I'll email Unrealized.