Two Hornsounds On One Locomotive

Cobra1996

Imagination At Work
It's my understanding that some locomotives irl have more than one hornsound. Some, like NKP 765, had one more whistle in play, while others, like SP 4449, had a whistle and an air horn.


Over the years I've been installing locomotives, I'd noticed that that's been done in the newer models, such as Steve Lerro's iteration of 765, as well as the NYC Niagara, among others.


But the big question here is, how is that possible? I'd noticed that I needed to be in realistic mode in order to use it, but how does one actually go about putting a second hornsound on a locomotive?
 
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