Disable input device for X

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http://forums.fedoraforum.org – Hi, I have a Kore Controller from Native Instruments (picture: http://www.tim-carter.com/music-prod.../pics/kore.jpg), using it as a sound card on Fedora 12. Its input knobs are supported by Linux, too, but they are pretty useless for me. It came out that these input knobs send mouse movements from time to time, letting my mouse pointer jumping to the upper left corner of the screen. So I want to disable the knobs, i.e. I want X to not interpret these "knob actions" as mouse movements. What is the best way to achive this? Can I disable it somewhere in HAL configuration or do I have to modify xorg.conf? And how do I do this? Simply plugging out the Kore Controller is not an option for me because I use it as sound card. (HowTos)