West Country/Battle of Britain (un-rebuilt) XL sound decoder

Below is a list of the Function keys and their assignments applicable to this model. F1. Sound on/off F2. Long whistle (latched) F3. Short whistle F4. Buffering up F5. Coupling up F6. Injectors F7. Drain cocks F8. Safety valves F9. Guards whistle F10. Carriage door ‘slam’ F11. Wheel/track ‘groan’ F12. Fireman shovelling F13. Shunting mode. Press once the loco goes slowly, press it again and you are back to normal control. F14. Acceleration/Deceleration override F15. Aux 1