I picked up one of these units in my LHS today on a lark. He had one running with a steam diorama and it caught my 'ear. I bought the diesel unit - hooked it up as per instructions to my Control Master 20 and find it somewhat interesting enough. I am running DC analog. (My 8 year old winces and/or jumps whenever he hears the "coupling sound" particularly. Sounds like an auto wreck.) We ran an operating session together - each taking turns with the throttle and sound controls. So the question - The programming of the sound or synchronization of the acceleration or deceleration of loco speed is not explained well enough in the instructions to program. Anyone have one and can explain it to me. The steam version worked so well in the store.