BR class 56 XL sound 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 F3.     Horn 2 F4.     Horn 3 F5.     Buffer up F6.     Coupling up F7.     Flange squeal F8.     Buffer clash on wagons  F9.     Guards whistle F10.   Carriage door slam   F11.   Aux 1 Fan F12.   Compressor F13.   Reds In Direction Of Travel F14.   Cab lights in direction of travel F15.   Drive hold F16.   Volume Control F17.   Shunting mode. Press once and the loco moves slowly, press it again and you are back to normal control F18.   acceleration/Brake override.  This function overrides the normal acceleration and braking settings.