Just two shots in the dark: Do you by any chance have at "Project settings -> Audio Settings" "Align beats to samples" ticked? This could have some effect when working with such a long file, I reckon. The other one, as you were talking of .wmv, could be a video synchronisation error, although you've got only audio which could be audio of a video file. As Schwa wrote, the file-length is 4:10:29.220 seconds, which is 15029.220 seconds. If the file was recorded in sync with 29.97 fps and is now played back with 30 fps (for whatever reason), it will play only 15014,19078 seconds, which is 4:10:14.191, so I wouldn't be too surprised, if there is some correlation. -Data