Comment 1 for bug 503361

This sounds like the type of issue that wouldn't be Amarok specific but instead closer to the underlying media framework that plays the files. In Amarok's case, that is Phonon, which will usually plug into Xine or Gstreamer in the backend.

Here are several things I'd like you to try so we can get a better sense of where the problem is:

1) play the files with another media program
2) play other files (standard mp3s or other filetype)
3) switch the phonon backend gstreamer<->xine

In which of these 3 scenarios do you hear the noisy playback?

4) Also, what version of Ubuntu are you running? Are you fully updated on patches?