I'm kind of in the same boat and want to share a similar experience....I hope, like you, someone can help. I have four Legacy seperate loops. On my outside loop my steam engines are not producing sound. The engines work fine smoke, lights, and movement all normal just no sound. The sound does not come out of my 2020 version Reading T1. I tried my new 10 wheeler on the "problem" loop and same result. Nothing out of the tender. But I have an new Lionel Legacy diesel S2 on a siding of this loop and it works fine. I moved the diesel out onto the main line and it ran and functioned fine. Not sure what is going on. Why the steam engines dont work but the diesel does. I also put the steam tender on the loop by itself and it does make sound. Any trouble shooting suggestions?