Gents, I checked the POT and the speaker. Both checked out...only thing left, I guess, is the sound card unless the Railsounds power board (691RSPRA00) be faulty, or since the car responds to TMCC commands to turn lights on and off and I can change the TMCC ID# mean it's OK? I've not yet swapped sound boards. I want to be sure the power board cannot fry a different sound board (if that's possible). So, my next move will be based on your advice. Thanks for your help.
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