On a Digitrax system, you would need to go into the settings of the throttle, and make F2 analog, then enable playable whistle. How hard you push the F2 button is how much virtual steam goes knto the whistle.That's interesting to know. I don't operate it on a regular basis, only when visiting layouts that are DCC. I will have to ask someone when I am at one of these layouts. It does have a nice sound system, but when operating on a strange layout, most of my attention is on getting my assignments done in a timely manner. Keeps my attention and not much time to experiment. I have no way to test it at home as I have no DCC system available. It would be interesting to know how they do it. With the PFM system, there is a lever that you moved down and depending on how far down you move it, it would vary the whistle accordingly. Don't know how they can do that with a button. I'll have to look into this. Thanks
On an NCE system, you do basically the same thing, but moving the throttle dial up and down while holding the horn button down quills the whistle.
In any case, you will need to configure a cv to make the whistle playable. I personally think the playable whistle in a Tsunami isn't all that much to get excited over, anyway.
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