Blimey, I never knew you could do that; thanks. I picked up an unused NCE Powercab full set at Auction and in total with commission and postage it still only cost me £120. Not sure if it had the upgraded Chip, BUT it works perfectly. I shall use one of my two (yes I know) other Handsets as the second Slave as you suggest!
Also, as stated above, the O6 is fine for others to use just for stop and go sort of Op's. In fact at the only Exhibition to which I took a previous EM layout, my Son, on Control at the front of the layout, used it for shunting an 08...for two days of 6 hour shifts! That 08 had a superb West Coast Digital Sound Chip with amazing slow speed control.
Phil