6008s with P20s don't activate the motor which makes it an amazingly quiet camera.
Unfortunately, the Sinar back on the 6008 keeps the motor going. I suspect the lack of camera-to-digital-back contacts on Sinar's adapter plate has a lot to do with this. I wish it had them!
Since the hy6 is not too far away, I'll put up with the energy expenditure of the Rollei motor and see what happens...