I first noticed this a few days ago, when I was playing a video in VLC player. At the time I figured the audio of the .avi was either encoded badly or VLC was acting up, so I dismissed it as an anomaly. However, I started noticing it more as I watched something else later that day, on files that usually play sound and video perfectly. I still thought it was VLC player though, so I restored all the default preferences, which didn't work, and I reinstalled and fully updated it but that didn't make a difference either. Today though, I realised the problem isn't VLC player because I noticed it while playing back a video on YouTube, and now I can hear it just playing audio through Foobar, which I couldn't before. I've tested playing the audio through my headphones and there is no fading in and out or jumps up in volume but there is when I play through the speakers, which makes me think it's down to the speakers. I also checked all the connections, cleaned and rewired them back up. Still, no difference. I checked whether I had any stupid audio effects on that might mess things up too, but I don't, so that can be ruled out too. Anybody have a differential diagnosis? I suspect that my speakers are sort of dying, and they are pretty old so it's not a surprise, although it is a pain in the ****. I accidentally had the speakers so loud the output audio distorted today too, which could have made it worse and led to it becoming more noticeable. The sound doesn't distort when it happens though, just turns itself down and up at seemingly random intervals, so I don't think I blew a speaker. Could it be a faulty connection in the hard-wires of the speaker setup? I'm running Windows XP with service pack 3, a Toneport UX1 soundcard, AMD Phenom II X4 840 processor, 4GB RAM, Nvidia GeForce GT 440 graphics card. Thanks.