There is a special Trainsounds board for TMCC control. I thought there may have been a couple, but I think there is only one. The part no. is 691-ISND-107. It has a nice single chime honker and a bell. This would work great for the Rectifier. For the GG-1 you might try removing the chip from the one you have and try it in the 107 ISND board, but I don't know if that would work.
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