Thanks, Ill do that

Thanks.
I really do not wish to strip out a pefectly working DCC decoder. I quite like the idea of a box car permanently attached.
Pleas forgive if my english seems a bit odd. I live in Scorland, UK

I have these units which are dcc only and would like to put in sound.
Any recommendations?
Even if it meant changing the whole decoder for one with sound, no problem, (but where the speaker would go?).
I also thought about stripping the motor and chip out of the B unit to use for the speakers and permanently join them together.
if that is the case, which decoder should I go for?