They can't hear me gtalk, skype

[Joe Feely]

I suspect this is an old cookie, and I fear I'm not seeing something
really simple or even obvious.
I can hear them, put they can't hear me.
Except once on a skype test call, I hear my voice, and on one gtalk
(Google) they could hear me after I set the left hand slider to zero and
the right hand slider to max in Alsa mixer.
I'm using XFCE in F15, been searching and reading alsamixer and other
stuff on web and man pages to no avail.
Any pointers, direction etc. Any info I could post to help?

Thanks.

-- 
Joe Feely