PCM Volume Control Keyboard Shortcut

[Dean Landry <dlandry cs dal ca>]

I've setup my multimedia keyboard to control volume using
gnome-keybinding-properties.  The binding succeeds and when I use the
volume controls from the keyboard, there is an onscreen indicator that
the volume is changing.

The problem is that this changes the master volume for the alsa mixer.
I need it to change the PCM volume (for some reason, PCM is the 'actual'
master volume).  Does anyone know how to change this behaviour? 

Thanks in advance,

Dean