BR class 20 XL sound decoder

Below is a list of the Function keys and their assignments applicable to this model. F1. Sound on/off F2. Horn 1 – double tone F3. Horn 2 – alternative double tone F4. Horn 3 – single tone F5. Buffering up to a train F6. Coupling up F7. Flange squeal F8. Buffer ‘clash’ on wagons F9. Guards whistle F10. Carriage door slam F11. Wheel/track `groan` F12. Shunting mode. Press once the loco goes slowly press again and you are back to normal control. F13. Accelleration/Decelleration. Press once to over ride, press again to cancel. F14. Aux 1 F15. Aux 2