I think there's something wrong with gstreamer0.10-av. I had old version of gstreamer0.10-av 0.5 and everything worked well. Than I updated codecs (gstreamer0.10-av to 0.5.1) and SomePlayer plays songs fast forwarded, than I updated to latest version gstreamer0.10-av 0.5.2 and now alarm tones not work. I'll try to downgrade to 0.5 again to see changes.