I have MusicMatch Jukebox Plus Version 10 which I uninstalled thinking it was the cause of the problem. I have reinstalled it, it has identified all my tracks ok but I have the same sound problem now with that.
Another issue is the Musicmatch burner won't load up at all, it throws up an error and freezes. I have emailed musicmatch about that, I think that if I'm paying for it they should sort it out.
I can't find anything similar to media player to rectify the problem. I'll just keep working on ot until I find it or I'll mail them again.