The problem with the MRC diesel decoders is that although they have "Two selectable, authentic 8-notch diesel prime mover sounds" they aren't the sounds that the prime mover of any of the locos the decoders are for: AC4400C, SD70, P42. They offer 2 decoders, one for the SD70 and AC4400, the other for the P42, with 2 more models, one for "Kato and Athearn" and one for "Atlas GP-38 and others" that aren't out yet. I assume they'll have the same 2 prime mover sounds, again, not matching the locos they go into.
Seems to me if I'm going to go to the trouble of installing sound into a loco, it'd be nice if it was at least 'close' to the right sound. Just my $0.05 on the matter (adjusted for inflation).
Their steam decoder suffers from the same issues but is a bit more useful as a generic steam sound decoder. I've installed a few of all of these in locos for other people and they all seem to be happy with the sound so perhaps I'm just being too picky.
