The Train Buddy installs a DCC Sound decoder from Train Control Systems with Keep Alive and a Soundtraxx “sugar cube” speaker. There should be 4 (now 5, maybe 6) parts to the whole install. It takes awhile to upload, sorry. I can’t afford, nor have access to, fiber yet. The install discusses topics of planning installs, wiring harnesses, soldering tips, LED installs, brass steam engine issues and solutions, making number boards and just a bunch of downright practical mechanical and electrical sense.