Bug#245192: Temporary Workaround
I too have experienced the "bubbling" sound using libarts1-mpeglib, I
narrowed it down to mpeglib itself, and not libarts1-mpeglib. By
installing mpeglib 4:3.1.5-1 from testing, the audio distortion seems to
go away, at the expense of breaking dependencies.
All other audio is fine, it is only mpeg playback that has this problem.
Debian Release: testing/unstable
Architecture: i386 (i686)