Sound decoder for the recent Bachmann class 158 using plux 22 decoder, please note no speaker is supplied with this decoder. Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on /off F1. Sound on/off F2. Horn 1 F3. Horn 2 F4. Doors opening and closing F5. Guards whistle F6. Reverse Gear Clunk F7. Driver/Guard buzzer F8. Flange squeal F9. Shunt mode F10. Acceleration/Deceleration override F11. Turns head and tail lights off B end F12. Turns head and tail lights off A end F.13 Interior Lights F.14 Cab lights opposite end to driving direction F15. Night lights