Sound Blaster Audigy 2z Platnium Strange noise

[Kungfucow]

I Run an internet based radio show off my computer. Recently, we've been getting a real strong reverb type noise, and I noticed that it can be reduced by turning the "Wave" source down in the surround mixer. However this also greatly reduces volume, and I have turn it to about 3%.(default at 50%) The reverb doesn't affect music, just mics. Anyone know what I should do?

*Speed is of the essence, as we broadcast every Friday!*