Thanks for the info.  I forgot to mention the ON 30 layout is controlled by Digitrax Zypher.  My own HO layout is Digitrax DCS 100.  The Atlas engines with Dig..... DH163 series decoders work just fine.  George

I enjoy the pleasure of operating an ON 30 layout at a friend's home.  There is an assortment of Shays, Heislers and other engines,  all Bachmann with DCC on board.  Recently we tried to set various CV's to fine tune operations.  I can set CV 2 start voltage and CV's 3 and 4 but cannot set CV 5 max speed nor CV 6 mid speed.  The print-out does not mention CV's 5 and 6.   Are they not supported by Bachmann decoders?

George J1