Ok, I got you now. The Kato sound box isn’t a decoder, it’s a sound generator. Doesn’t work like a decoder. The sound is based on input voltage coming from the transformer. You could connnect a lightbulb to the rails and it will sound like an EMD or GS4 or whatever card is in there. The back emf is a bonus to help sync, but it is still a manual adjustment to get the sync right. Three volts equals 20 mph sounds, for example. At least that is the way I saw it and read it to work. Cool but not $200+ dollars of cool. I decided I’d Rather have DCC for less money!