I just purchased a Bachmann GP9 diesel #6431 B&O (Blue and Yellow) with DCC onboard.
What do I need to do for the sound at it's optimum?
What do I need to do for the sound at it's optimum?
![Huh? ???](https://www.bachmanntrains.com/home-usa/board/Smileys/default/huh.gif)
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