This Christmas, I was graciously given a slick Griffin Powermate from my brother. It's a nifty little aluminum knob for your PC, with an extremely smooth touch and a blue LED that makes the bottom glow. There's support in the Linux kernel for the device, and it acts like a regular old input device. If you're crafty, you can edit your xorg.conf to make it control X, or you can use other software's built-in support for the device. Both the free DJ software Mixxx and The Gimp support the device. Mixxx's support needs a bit of work, but the device works great in The Gimp. However, there doesn't seem to be any documentation on how to actually set...