I am baffled: have a very standard and simple LokPilot v4 decoder installed in a locomotive (this has no sound). And yet for some reason, DecoderPro is unable to read the CVs from the decoder. I have a Digitrax DCS 200 (which I bought in 2012) and am connected via a LocoBuffer USB. I was able to read all of my other locomotives with no problem at all - just this one decoder has been giving me trouble . Is there some special trick for reading these decoders?