I have a Rail King Cab Forward that I want to upgrade to TMCC using the ERR boards. I never thought of using the GS4 sound set with extra magnates. But I have a question regarding your 1st couple of videos, why did the sound go back and forth between slow chuffs and fast chuffs while the speed was mostly constant? And you said you wanted all the sounds except for the air pumps. Is there an ERR board that has those air pumps and the horn?
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