Comment 63 for bug 141445

Someone found a solution to the default PulseAudio settings in Karmic 9.10 quite easy:

>http://ohioloco.ubuntuforums.org/showthread.php?t=1310074
>
>Found a fix for the PulseAudio HDA Bug
>I have been fighting with PulseAudio for 3 days, harassing people in the forums trying to cure the "crackle" noise on my Nvidia >HDA sound card. Well I think I found a solution and can't believe it was so simple!
>
>Go into System - Preferences - Main Menu for the menu editor. Inside the editor go to System - Preferences and un-hide >Multimedia Systems Selector. In there you can change your default sound systems to ALSA!

I tested it and it solves the 9.10 default audio card assignation to PulseAudio. Once the System/Preference/Multimedia system selector appears the microphone issue is solced on my system by selecting the input hardware device that points to "alsa_input.pci"

Cheers