What features or advantages would one gain by using the conversion kit to make the turntable DCC?
Roger,
Don't know the answer to your question vis-a-vis the Walthers DCC controller.
However, I added a mobile (locomotive) decode to mine so that it was controllable from a throttle using the F0 and F1 keys. I also powered the decoder from the track.
I found it a waste of time for two reasons: first, it was simpler to just press the controller buttons versus dial up a decoder address and then use the keys on the throttle. Second, I powered it from the track so that I didn't need a walt wart. Worked fine with my Zephyr on my test track. Problem was on the layout with my super chief, it seemed to get messed up often and forget its settings. I determined that the 11.4 v DCC I had on the track from the super chief N setting passing through the decoder left about 10 volts to go to the controller, but the controller needs about 12-20 volts A/C or something like that. And so there just wasn't enough voltage. The reason the Zephyr worked is because it puts out about 17 volts iirc.
Anyway I removed the decoder, still power it by a wall wart and use the controllers buttons.