Where no facility has been provided by the manufacturer 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. Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on/off (where fitted) F1. Sound on/off F2. Long hooter (press once and hooter will sound until pressed again) F3. Short hooter F4. Buffering up F5. Coupling up F6. Injectors F7. Drain cocks F8. Safety valve F9. Guards whistle F10. Door slam F11. Wheel/track ‘groan’ F12. Buffer ‘clash’ on wagons, 8 second sequence F13. Shunting mode. Press once the loco goes slowly, press it again and you are back to normal control. F14. Acceleration/Deceleration over ride. Press once to over ride, press again to return to preset settings. F15. Aux 1