OK here's how I fixed it- I DID install Manilla in one big piece, but I DLed & installed the Opal Overlay by itself & then uninstalled it. Viola- the volume slider is back
I also edited the gain table via the registry & changed the sound value from 2 to 5. The only problem I will ever have with hearing people now is if this phone DEAFENS me. WOW this thing gets loud!
Sweet. Thanks for your help guys.