Mp3 files do not sound good when I use mplayer in ubuntu 12.04. I am running ubuntu on a imac in virtualbox. The bigger mp3 files have a lower sound quality than the smaller mp3 files I listen to. I've noticed that it seems like the number of tabs in firefox that are open seems to have an affect but not all the time. The mp3 will sound fine for a while then for a couple of seconds it will sound scratchy and then a couple of seconds later it sounds fine.
Has anyone else had a problem like this or have any ideas how to stop the audio quality from dropping in and out.