Some may be interested in this link for the Bachmann sound equipped locos.
http://www.soundtraxx.com/factory/OEM%20pages/Bachmann/Bachmann.php
The Documentation list is not all for the Bachmann locos. It is the usual SoundTraxx documentation list.
BUT, maybe that could change as Athearn has the Tsunami in their diesels. I would be guessing the Bachmann powers to be are looking into diesel sound.
Rich