Sound problem!

Was listening to some music on my PC this morning and noticed there is a heaps of echoing (reverb?) on the sound now. Which is odd, as I haven't changed any setting or updatd anything recently, except upgrading to MSN 6.1 yesterday evening.

Anyone got any ideas?

My mobo is an MSI K7N2 delta, I'm using the digital coax out, in to some Megaworks 250Ds.

Thanks for any help.

Have you got EAX turned on?

Uh, I can't see an option for it in the soundstorm menu.
Will it be somewhere else?

... try unchecking the option for equalizer presets in the sound-storm driver menu - where it says something like "enable effects" (half way down on the left of that screen IIRC).