With gmb, sometime the sound "crash". I can hear the music sound beyond the "crash". On slow volume there is just a small crash.
It usually happens at first song played, or at end of the song / beginning of a new song.
May be it's a Quantal problem, or a sound card compatibility, but I report the bug, just in case.
I can test what you want.
I will report if I find a soluce.
It was a Quantal problem, solved with the last updates (containing Pulse audio update).