Volume Control Error

[james@4thharmonic.com]

Hi, 

I finally successfully installed Debian on my ibook G3! :)
However, the sound isn't working... when I click the volume control icon, I 
get this message: 

Error 

The volume control did not find any elements and/or devices to control. This 
means either that you don't have the right GStreamer plugins installed, or 
that you don't have a sound card configured. 

You can remove the volume control from the panel by right-clicking the 
speaker icon on the panel and selecting "Remove From Panel" from the menu. 

Can anyone help me resolve this? 

thanks 

James