Or if you're even less lucky, PulseAudio still requires you to mute the "system sounds" thing because once skype starts, you get persistent noise out of the aud

Or if you're even less lucky, PulseAudio still requires you to mute the "system sounds" thing because once skype starts, you get persistent noise out of the audio jack, after which you try to email Lennart following the guide on his page, only to receive no reply.