This is a topic which South West Digital have been addressing for the past two or three years. The ESU decoder, in the right hands, is capable of producing the right sounds at the right time, hence they market their sounds as YouDrive. With their systems it is possible to imagine you are indeed driving your steam locos. They are created by someone who knows the decoder intimately and has the support of someone who knows how to drive a steam loco and what should typically happen and when. Guidance notes are given with each system but improves with practice and familiarity. Many sound systems are videoed on YouTube and frankly many are substantially flawed, usually by ignorance of the prototype and sometimes, amazingly, by the attitude 'that it doesn't matter'! You spend quite a lot of money on currently available r-t-r locos so why put up with a poor and often inaccurate sound system? FSB