I have to say, "same here," although I always just figured it was a result of some driver/device engagement in my less-than-stellar equipment suite. As CritterMan described, it's just a "blip" or "rounded click" when cueing through a playing song with the progress bar. This with WASAPI. I had accepted it was part of the deal when cueing through a song instead of being PATIENT, haha.. I hear the same thing with AIMP (as long as the OP mentioned it) using WASAPI, only it's a shorter/sharper sound there. I don't fade out/in/blend anything as I choose to avoid resampling, if that makes any difference. "No biggie."