I recently got one of the new HST's with DCC and thought it would be nice to be able to switch of the cab light. But I have found that itdoes not seem possible to control the additional function outputs, green and purple wires. The green always seems to be on regardless of F3 operation and purple always seems to be off regardless of F4 operation. Anyone know of a CV that needs to be set to make them work. The decoder is R8249 with a Digitrax DCC system. Otherwise lights and operation of the power cars is great.