ESU Loksound V3.5 HO Scale Note; Email Or Call for Prototype Sound for Loco Ex; steam or disel, # of cylinders, turbo or not, airhorn type, brakes; with or without dynamic With Loudspeaker 0.92", 23mm round 100 Ohms, with sound chamber Variety of sound ESU, as market and technology leader, takes your demands for sound realism very seriously. That’s why we offer, for the LokSound V3.5 alone, over 400 (!) sound variants. When you purchase a sound module of a certain prototype from us, you can be sure the sound comes from that loco. Guaranteed! You can count on it.