Heheh, I had something similar recently. I was playing around with a voice removal plugin in Winamp. I pretty much erases things that are in the centre of the stereo image. Well, I was listening to the '96 (or so) remix of Don't Dream It's Over, and the guitar solo began. The guitar playing the solo was inaudible thanks to the plugin, and all of a sudden I discovered another guitar playing something different at the same time I had never heard it before. So now (without the plugin) I can still hear it. It's also present in the original '86 version, but you'll have to listen very closely,and I think you'll only notice it if you know how it sounds.