I installed a Tsunami in one of their K4s. I managed to get everything working acceptably, except the smoke unit. I couldn't get it to chuff smoke, though I didn't really try very hard. You could use a Loksound decoder in the same manner, using the functions for cab lights, markers, and headlights. A pair of wires to and from a plug to the tender-mounted speakers would bypass the "junk" in the multi-use drawbar. I removed the electronics, and put the decoder inside the boiler.