I've got the folder in place and registered it.
A usb keyboard will light plugged into the old Voyage,
but only if KindleLazy is on, so there's no way to do a comparable test on the KOA2 without a JB.
What is your thinking about bluetooth? Does it look likely? I can only see that it will pair with a device with audio such as speakers or earbuds, not with a simple volume control, which is all that would be needed.
