yes, that’s exactly what i want to do !
I wanted to use one to act as a modwheel with bome midi translator (i don’t have a modwheel on my U1). I’m trying to get my hand on a CH, but the one i found has been sold 
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as there is 4 channel controler per unit, is it possible to control the master output by one of them, all the time ?
if not possible as i’ll have in few days 2xFD, can i use one to control the master out only and the other FD to act normally ?
I read that the point is to plug the one to be used “not normally” after cubase started. i have a Usb Hub with on/off switch, i hope it will do the trick. really too bad that these beautiful small piece of hardware didn’t met his audience.