Installing a Hornby HM 7000 sound decoder

In this video I show you how to install a Hornby HM 7000, 21 pin sound decoder into a Bachmann Class 66.
I then show you how easy it is to use the HM app to control your trains and sound functions via a smart phone. Will this decoder work with my Gaugemaster Prodigy Advance 2? We find out as I run through the various sounds available for the 66 before giving my verdict on this product.

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