Change Sound Group Volume?

Been trying to figure this one out but with no luck, not even sure its possible.

I know the alternative is to find the sound classes and try to modify their properties but isnt there a better way?

I am trying to put the final touches on my menu system and am looking into creating volume sliders for the channels Music, SFX, Voice and General.

Any clues?

I know rama and a couple other guys have done something like this, I just need a way to access the volume property and have the game store it somehow