GM class 66/9 (low emission variant) sound decoder and speaker (21)

Description

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, two tone
F3. Horn 2, single tone
F4. Horn 3, single tone
F5. Buffer up
F6. Wheel/track `groan`
F7. Flange squeal
F8. Sound of sanding the wheels for grip on acceleration
F9. Notch up
F10. Notch down
F11. Shunting mode, Press once the loco goes half speed, press it again and you are back to normal control.
F12. Acceleration/Deceleration speed over ride.
F13. Aux1
F14. Aux2