Bachmann Spectrum Cenntennial, decoder installation

[DA BEAR]

I have a Spectrum DDA40X Cenntennial, and I want to put decoders , or decoder singular in it to run on our club layout. We have an NCE system, and I was thinking of one sound decoder and one non sound-decoder. The stall load is approx. 1.3 amps, and several of our club members say that it is almost impossible to sync a sound with a non-sound decoder. One other option suggested was a sound only decoder and a motion only decoder. I am curious if anyone has ever done this installation before. Thanks in advance from All Points North Model RR Club