Need Help (Audio Related)

[Mr.Big]

My audio is "spiking" the volume goes up and then back to normal and does this a few times over the duration of a song (winamp,youtube), i haven't noticed it doing this ingame.
Anyway this is driving me NUTS! and i cant really find anything about it on the interwebs.

I have a SB-Xfi Xtreme Audio. But i dont think its the card since this has only happened to me for the past month or so. My friend say's he has a similar problem but he has no idea what it is. Also i have a Creative T7900 Inspire 7.1 Speaker system.

So so any ideas?

Oh also i just tried unplugging all the wires and plugging them back in on the woofer, so im gonna see if that does something [Edit] Didint do squat