Sadly, the sound board in these is strictly conventional, so it has to be replaced. John wanted the medium steam ERR board, so that's what he got. Since the Cruise Commander doesn't fit in the locomotive, I used a Cruise Commander M, the original Mogul TMCC motherboard, and an R2LC. I made the cables needed to connect it all together, and of course added the Super-Chuffer and rebuilt the smoke unit. I also couldn't keep the wireless drawbar as the ERR RS Commander doesn't support that option, so I used Minatronics mini-cables for a tether.
Here's a video of the upgraded locomotive.
Send me an email if you want to talk about upgrades.
