Hello, I'm very new to DCC.... My buddy just bought a Proto 2000 Sw9 loco at a train show today. The box indicates that there is no sound or DCC included but that it could be upgraded with some work. Which decoder and sound system would work best for this loco? He has the digitrax super chief system, and I'll be getting the MRC Prodigy wireless soon. We can program on either system. Thanks for any help!