Trouble with pictured logitech marble mouse

[ken-ebbs]

First of all, thank you so much for doing this. I'm a quadriplegic and trying to ultimately get a Kensington large trackball mouse to work with the XAC. For now I have the same mouse in your README (an older Logitech marble mouse) and here's the behavior I'm seeing with the trackball/mouse2xac plugged into the left XAC usb port (with NO 5V 2A power)...The trackball does nothing unless the left/right buttons are held down and then it moves vertically only. The left and right buttons control horizontal movement. I was hoping to use the trackball to move both horizontally and vertically. Am I doing something wrong? Do I need the 5V2A power supply for this mouse?