“…The precision of the modern miniature trains is astounding, and the overall impression is further increased by means of dynamic smoke generators, independent lights, functional couplers and sound modules which replicate the sounds of the real trains, all these being driven by digital decoders which are installed into each locomotive and even into railway-cars (fig. 1) [2,3,4]. The digital decoders and sound modules must comply with very strict requirements which concern quality, safety, signal and functions standardization, reproducibility, usage, settings etc.…”