Interesting. I've not yet noticed it (the pop). I just tried ten or so times playing through my computer speaker (yes, there's only one of them!) with no success. I would expect you might get such a thing if there was still music coming out of your speakers when you called the little selecter program, because there might be a sudden change in the multiplier. However, when the player stops, the output buffer gets filled with zeroes, I think. By the time the selecter program runs, I would expect only silence, so changing the multiplier won't affect anything. Have you noticed any patterns as to when it happens? During a particularly soft piece of music, for example? Does it happen only when booting the player, or only when you select "Quit" from the menu, or both?

Richard.