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I read where a switch was installed between the DSX decoder and the other decoder driving the motor to help programming. Apparently, isolating the sound decoder will keep you from reprogramming it when programming the other or vice-versa. I'm going to do a sound installation, but I'm waiting on the Tsunami ( lack of capital not so much product quality). You said your B-unit is DCC equipped, does that mean its powered? I don't know if there will be enough room in a powered "B" for a sound decoder and speaker. Plase keep us posted and good luck!
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