Thanks, I think I've figured it out. I recently installed the a new sound system (Microsoft Digital Sound System DS80), and I found that if I unplug the speakers, the click is there in the laptop speakers.

If I plug the speakers back in, the click works again. If I switch to another app and back, the clicks are gone until I unplug and replug the speakers.

If the clicks are gone, and I start the tune again, they come back. But if I wait a while they might be gone again.

Very weird. Any ideas?

Last edited by TromboneAl; 08/08/12 05:18 PM.