ESU Sound Decoder A4 - ESU sound decoder and speaker

Below is a list of the Function keys and their assignments applicable to this model.
F0. Lights on/off (where fitted)
F1. Sound on/off
F2. Long whistle
F3. Short whistle
F4. Buffer up
F5. Couple up
F6. Injectors
F7. Drain cocks
F8. Safety valve
F9. Guards whistle
F10. Carriage door slam
F11. Wheel/track ‘groan’
F12. Fireman shovelling
F13. Shunt mode – half speed
F14. Acceleration/Deceleration override
F15. Aux 1