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JPM I am a former owner of the MRC diesel sound decoder that I had in a Up AC4400. The sound is so loud which is the problem. It was like a high pitch sound too. If you have any rodents in the trainroom they will all scatter and so will you. LOL Anyway I recently sold that engine and decoder because I di dnot like the sound of it and it was very annoying. I now have the Soundtraxx decoder coming back to me. As for the sound issue the soundtraxx was all good. I guess for starters sound you can buy he MRC decoder but you will soon learn that you might not like it also. I sold the decoder installed in the train for a mere $70. A RTR athearn AC4400 with the Mrc Decoder. Wow the buyer got a deal I guess. I get rid of an annoying sound unit. We both are happy. I personnall think that you should save the $50 on that decoder and get the other $50 to buy a soundtraxx. You will be much pleased with the sound. I am sure of that.
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