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Try using the "DynamicAmbientSound." In its properties you can setup multiple sounds (in a list), and they will play randomly as you've set them up. IE. it checks every 20 seconds, and has a 0.8 probability that a sound on the list will play. Stuff like that. I use a couple of them in ZahltagOps, which will randomly play a police car siren. Take a look at them. One is near the hole in the wall near the ramp, and the other is in the corner near the wall between the dance club and the apartment building.
I use triggered MusicEvents for changing music (don't forget not to broadcast it to everyone), but they're not random. Or you could add lots of triggers in the map and once someone steps on one, the music changes. That would be a nice touch in map theme, like it is used in the Sunspire.
