Class 37 (refurbished) sound decoder and speaker (21)

Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on/off (if fitted on model) F1. Sound on/off F2. Horn 1 – double tone a F3. Horn 2 – double tone b F4. Horn 3 – single tone F5. Buffer up F6. Coupling up F7. Flange squeal F8. Wheel/track ‘groan’ F9. Brake release F10. Blower fan F11. Air ‘tick’ F12. Guards whistle F13. Shunting mode. Press once the loco goes slowly press again and you are back to normal control. F14. Acceleration/Deceleration. Press once to over ride, press again to cancel F15. Aux 1 – cab light if applicable