Further to MartyE's comment above about CAB1L's ability to 'quill' the whistle/horn, the Owner's Manual that came with the CAB-1L & BASE-1L Combo I bought a few years ago states in part "Hold down the SET key and press the WSTL/HRN key to toggle the whistle configuration between TMCC1 and LEGACY style for the current engine or train. The CAB-1L will beep once if the TMCC1 whistle style is selected, or it will beep twice if the LEGACY quilling whistle is selected instead."
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