If you are having issues on a hardy box. the package causing the issue would be the flash plugin since it is the one that does not play nice with pulseaudio, which is the new sounds server on ubuntu and not ALSA as you stated.
If you are having issues on a hardy box. the package causing the issue would be the flash plugin since it is the one that does not play nice with pulseaudio, which is the new sounds server on ubuntu and not ALSA as you stated.