ESU Sound Decoder Castle Class - ESU sound decoder and speaker

We recommend that both decoder and speaker are fitted in the tender due to space (please remember decoders can get hot) and sound considerations. Four wires will need to be run through to the loco for pick-ups and we would recommend a connector so that the loco and tender can be separated.
Below is a list of the Function keys and their assignments applicable to this model.
F1. Sound on/off
F2. Long whistle (continues until F2 is pressed again)
F3. Short whistle
F4. Buffering up
F5. Coupling up
F6. Injectors
F7. Drain cocks
F8. Safety valve
F9. Track/sleeper ‘groan’
F10. Carriage door ‘slam’
F11. Guards whistle
F12. Shunting mode. Press once the loco goes slowly, press it again and you are back to normal control.
F13. Acceleration/Deceleration over ride. Press once to over ride, press again to return to preset settings.
F14. Aux 1 linked to firebox flicker as per coal shovelling
F15. Aux 2