Volume control

Small, relatively easy request (I think): Could you guys add a volume control for the notifications and IM receives. Normally I dont like the IM sounds being too loud and annoying when i'm doing casual stuff like surfing or typing. But in game, when there are other sounds, the IM sounds just get drowned out, and I like the audio notification when I'm gaming. So i'm not asking for 2 different modes. Just a simple volume control setting would be nice.