Hi all.<br>I was having problems with applications using the microphone.<br>Then I remembered about the struggling I had with KDE and KMix.<br>I installed it (yes, KMix under XFCE!) and copied the configuration.<br>The microphone started working magically.<br>
This means that the xfce4-mixer has some troubles that are not present in the KDE one.<br>It's a pity, but at least I can use Skype again!<br>