Kensington Expert Trackball Mouse

One of these now sits on top of my TI2.
[Blockierte Grafik: https://images-na.ssl-images-a…I/61SgMNdjgwL._SX355_.jpg]
I set the scroll ring(it's around the trackball) resolution really high and use it when hovering over parameters in VC. It's like a data entry knob. It will also work on all parameters in your DAW that respond to a mouse's scroll wheel.

There are a bunch of different trackball mice available. I liked this one best because of that ring. You can also program the buttons to perform custom key combinations. At the moment I have nothing assigned but I have used copy and paste in the past.