Tom. I tried to reply earlier, but now for some reason I no longer see my response. You make several great points, which I will check out. I do have the American Model sound controller, but I also purchased this used and not sure it works. I did hook up as suggested and tried it with several other American Model engines, with no success. I also did not know the chug was mechanical, and do hear a hissing sound rather than chug, so will try to check the orifice for blockage. Very helpful response and much appreciated. Mike
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