Power pro uses a 18 volt DC supply. This means less than a 18 volt DCC signal will be available to the track unless there is a dc to dc converter in the receiver. My system requires a 30 volt DC power pack and gives me 24 volts to the track.
18 volts is fine for slow engines (Steam) but not for high speed diesels or electrics.
Gere E should have better info on NCE systems, I only know what I read on the NCE site.