I have had my MTH RailKing engine modified with an ERR control and sound board. I can't seem to increase the volume of the sound. I opened the tender and adjusted the "pot" by turing is slightly clockwise. This didn't help. I tried using the Aux-1 with "1" per the instructions. I am using my Legacy Cab-2 but in the Cab-1 mode for TMCC. Any ideas?
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