mth proto3 is a free Model Railroad Discussion Forum and photo gallery. We cover all scales and sizes of model railroads. Whether you're a master model railroader or just getting started, you'll find something of interest here.

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    MTH Proto 3 Sound decoder help!!!!!!

    Just wondering if anyone has had trouble acsessing F13-F28 with a MTH Proto 3 Sound decoder. I have a HO MTH ESS44AC and I am unable to get these functions to work. I have a MRC Prodigy Advanced2 DCC system that supports F1-F28. I have tried to contact MTH service, they are useless. I can't find...

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