I have an odd and frustrating one. I just upgraded from Kubuntu Feisty to Gutsy. I have managed to get every thing that worked under feisty to work under gutsy except one thing. The Master volume control on kmix. Under feisty I configure the two audio controllers I have 1. Microsoft Livechat LX 3000 usb headset and 2. on-board ATI SB HDA Intel controller. After much messing around I got the headset as default and set the Speaker control as the master through the Kmix menu. On feisty it worked.. ...