Wondering if anyone could help me out. I apologize if this was already asked, but I looked and couldn't find anything with a similar problem.

Whenever I have TS3 open, any other application that has volume, such as YouTube, Windows Media Player, etc., begins to fade in and out. It will start off fine, but then it will suddenly drop and sound like it is coming out of a cave, and then return to normal for a brief period, and then repeat again. This is especially noticeable when there is someone speaking in the video. I already tried disabling the Echo thing and whatnot, but the problem is still there. The thing is, even when I am alone in a channel, or no one is speaking, and my microphone is muted, this problem is still there. I have tested it, and it only happens when TS3 is open. If anyone could help me it would be much appreciated!