Just a bit of basic info. I have a basic DCC layout using a Hornby basic entry level Hornby DCC select controller as I' m restricted by room and money. I run British as well as American models on my layout just to have an interest in the hobby, now to the problem. I recently purchased a Bachmann Part No 64303 HO model diesel loco with DCC sound value on board from a US hobby store by mail and was going to use on my layout. I was stopped abruptly when checking out items on E-Bay and came across a couple of E-Bay shops here in Australia advertising  the same loco for sale but what caught my eye was the warning stating that Bachmann would not honour any warranty claims if this loco is used with Hornby DCC. I came to the conclusion very quickly that Hornby DCC must be causing problems with Bachmann sound value DCC loco' s, I was under the impression that Hornby DCC was NMRA compliant.
My question is can any body advise me of what the problem is with Bachmann' s sound value loco' s and Hornby DCC and the Bachmann warranty information.