Co-op maps help

Hello, I very like Hidden and Dangerous 2, it's awesome, but it's a shame that game developers did not made co-op, there are maps instead. But I want to know if there's any way to hear music during playing co-op with my friend with multiplayer mode. I would like to hear ambient/battle music just like in single player. Can this be done?

Well, that doesn't count , If I want ambient/battle music it would be pretty annoying to change music from ambient to battle and vice versa So there's no any way to add music for multiplayer server via command, script etc.?

No, we're playing without TeamSpeak, but I'd like to hear ambient/battle music just like in SP. Can I somehow add it during multiplayer? =D

I think the audio system is "hardcoded" into game exe, changing it from there is more difficult.
U can add whatever music into mission by editing the mission, but this will require editing all missions that u like to play with custom background audio.

One more possibility:
If u have soundcard with multichannel output or more then one soundcard, then find some music player that have option to choose the channels or hardware that are used for audio output. Or use CD player or mp3 player or other computer or radio for the music and with some audio mixer you can mix game audio and other audio.