ESU - Metrovick Class 28 Co-Bo ESU sound decoder and speaker

F0.   Lights on /off  (If Fitted)
F1.   Sound on/off
F2.   Hign Horn playable
F3.   Low Horn playable
F4.   Low Horn Short 
F5.   Buffer up
F6.   Coupling up
F7.   Flange squeal
F8.   Buffer clash on wagons sequence
F9.   Guards whistle
F10. Fan
F11. Track/sleeper ‘groan’
F12. Sander
F13. Uncoupling
F14. Shunting mode, 1/2 Speed Control
F15. Acceleration/Deceleration speed over ride.
F16. Aux1