CV1 is the short address CV. CV3 and 4 are acceleration/decelertion.Didn't think you could adjust CV3 as it's the short address CV. If the loco's one of the early SD70ACe production, then there's only about 4 CV's available. They were supposed to come with the long address (CV17 & 18) already pre-set to the cab number at the factory. The newer editions say the have a DCC decoder in them (apparently in addition to the DCS one) which makes them compatible with other DCC decoder brands for consisting. Maybe, like the earlier DCC compatibles, it's still lacking many features we expect wit a full function decoder. Wouldn't surprise me.