you will need to add jKey or some other module that will take character inputs from special characters and use them as hotkeys to execute a volume up or volume down. i'm in the process of trying to do all this with my laptop...but litestep's kinda acting screwy when i load any other key input module besides jKey the last couple days...

also there's a good post in the modules section about this. the searchie dingie's been broken lately, so just ignore deuce.