Brush class 57 sound decoder with speaker (8)

With the Heljan model please ensure the directional lights are functioning correctly prior to decoder installation. We have found some models where bulbs are creating a `short` which can cause damage to the decoder. 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, double tone F3. Horn 2, double tone F4. Horn, single tone F5. Buffer up F6. Coupling up F7. Flange squeal F8. Air ‘tick’ F9. Shunting mode. Press once the loco goes slowly, press again and you are back to normal control. F10. Acceleration/Deceleration timing over-ride F11. Aux 1 F12. Aux 2