Soundtraxx has decoders designed specifically for Athearn. Although none of them have the sounds of the loco you are planning to upgrade, here's the link:
http://www.soundtraxx.com/dsd/tsunami/1000gn.php
TSU-AT1000 #828048 may also work.
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The SoundTraxx web site said that you can use a TSU-1000 decoder #827109.
There are factory equiped units with DCC sound already installed too.
Not sure if the factory sound equiped units are using a TSU-1000 decoder?
Hello All. I have been looking to upgrade my Athearn Genesis MP15AC to a decoder with sound. I was thinking of going with a tsunami decoder. Does anybody know what the best Tsunami Sound Decoder that can fit in a Athearn Genesis MP15AC? Thanks!