I posted this in Home Studio by accident. I have recently discovered that the problem occurs in all audio playback. Thanks for any help. I have Sonar X1 Essentials with wdos7 64 bit. I am using a Line6 UX2 interface with pod farm. It has worked fine for a couple years. Now when I play back a multi track CW project it pops, skips, or burps. It sounds like an over driven track (for a millisecond) but there are not overdriven tracks. I tried changing the buffer speeds but it still does the same thing. I updated the drivers for the UX2 and still the same thing. It is never in the same spot (measure) and happens on my r MP3 saved on my computer and also on the songs forum. Any ideas? Oh, how are y'all?