I've been an N Scaler for 50+ years, but have no DCC experience. A generous friend gave me his MRC Prodigy Advance DCC system which dates from 2005 and a few DCC equipped locomotives. I've been having a whole lot of fun running them on my temporary oval and have a few questions about programming their decoders. How do I know what CV values to start with when programming Start Voltage, Acceleration Rate, Deacceleration Rate, Top Voltage and Mid Voltage? The throttle's LCD screen shows three spaces for the CVs, but I don't know what to key in. I'd like to begin by slowing down the Acceleration rate on the steam locomotive, an Athearn Challenger which runs beautifully and has sound too. I'm really worried about messing things up and ruining my DCC locomotives. Thanks y'all!