I don't know if it is graduated, like it is in real life. You should be safe at 2/3 speed (Langsemere Fahrt Voraus), because unless they are actively listening for you you're still harder to detect than at higher speeds. I suspect from what people have said that it's either silent or full, with no in-between. But, as I said, I don't know.
Would be nice, though.
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