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[–] 3 points 4 months ago* (last edited 4 months ago)

You could in theory make a channel with a bunch of different stable whistle frequencies, and add some other aerodynamic feature that kicks it through them. I doubt you could reasonably do more than a few notes that way, though, and you probably have to hit them in order.

More likely it's just multiple bullets, as the other reply said.

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