I bought a Microtrains FT A-B pair and the drop-in decoders to convert them to DCC. Now I am thinking about adding sound by putting an additional decoder and speaker in a box car that will remain just behind the diesel units on my layout. What do you folks with experience in this recommend for the decoder? Looking for appropriate engine sounds, bell and horn at a minimum, but would like the other train noises such as brakes, couplers and wheels, too. Steve