The hub is a WiRanger USB 2.0 wireless wi-fi device. Great product BTW.
I suspect that I'd need better buffering for this to work. To put it another way - I suspect that the usb connection for this Macbook Pro trackpad isn't made to be truly hot plugable because it normally doesn't have to be. I think the issue is that over the wireless there will be lags or dropouts here and there and this trackpad would need to be more hot-swap capable to work in this application.
It works great just plugging into the Mac although I have had the usb port shut down a couple times when I pulled the plug out. Maybe I need to add some basic usb buffer circuit. Maybe I should just buy a track pad from Apple since they're making them now and quit screwing around...
Still, this one would be a perfect fit for my wireless mixer, so I'm still interested in a solution.