Legacy engine sound stops

I would try resetting it. Sometimes that clears out any bugs.

Are you running in conventional mode or command mode?  That is odd if the track power is constant.

Being a modular https://www.lionelsupport.com/...-Diesel-1261-6-28599

I would reseat the cards. Especially given that it happens from forward to reverse, I'm thinking the power board or the railsounds card is wiggling and breaking contact.

This is the first Legacy I am aware of with the AC motor instead of a DC can.- Learn something new every day.

I run it in legacy command mode. I've tried resetting the engine several times, clearing the command base and reloading the engine and it still messes up.

I've also reseated the boards several times and even pulled them out using contact cleaner letting it dry before reinserting the boards just to be sure the contacts are clean..

I forgot to mention sometime i'll command startup and it will start say the crew talk then shut down sound before moving.

Well, the other one is reseat the chips on the sound card, every once in a blue mon here are stories of oxidation on those contacts and given it sounds like the sound card processor is resting or getting out of sequence, that might be a cause.

Just trying to come up with fixes short of replacing components.

Actually, the oxidation on the contacts of the PLCC chips are fairly common, I probably seen that issue at least a couple times a year.  If you do try to reseat the chips, you MUST use a PLCC extraction tool, do NOT try to pry them out with a screwdriver or similar tool!

I'll have to try the reseat of the PLCC chip as soon as I receive the tool from amazon.

When you get the tool, make sure you use it correctly.  You need to get both tips under the chip, then gently squeeze to take up the slack until the tool has been pulled down to touch the socket.  When holding the tool vertical over the socket squeeze to remove the chip.  It's only necessary to move the chip up a bit in the socket and then press it back in place, we're just trying to make a good contact and scrub the oxidation off the tin pins of the chip.