[CentOS] I/) Settings for Skype

I've managed to get Skype set up and working.  I can hear the other 
person talking, but she can't hear me.  During a conversation, I tried 
what I thought to be all possible settings in both the "Volume Control" 
application and in Skype itself.  But no joy.

To make matters more puzzling, I had skype working on this same machine 
last year using CentOS 5.6... or maybe it was 5.7... I don't recall. 
And I've successfully recorded my own voice with this same microphone on 
Audacity.

So is there some secret to getting the Skype settings right?

Or are there some (other) tests I can run outside of Skype to determine 
what the I/O settings within Skype should be.


Any help is much appreciated.