Do any of you know what is the smallest STEAM sound decoder with good quality. I have used the Tsunami Micro 750 and the Digitrax SDN144PS so I know these sizes. The Micro 750 is bigger than the Digitrax 144 but what is smaller than the Digitrax 144. Thinking of using a real small one as a sound decoder connection for a loco that has motor DCC already and this would add sound. Ron