I added some sound strips ( mp3 HD ) into my video sequencer but was getting no sound when hitting alt-a for the preview. I found if I shut down Blender, start up Totem, start playing a video in Totem, and then re-start Blender the sound in the preview now works. I can then shut down Totem and the sound preview continues to work until my next reboot.
Also, if I start Blender first and then start Totem while Blender is still running Totem will playback the video at one or two FPS.
Anybody ever hear anything like this?