Thanks for the video..I’ll have to pay more attention tomorrow and see what sounds they makeAll males do is huff - only the hens will make a soft trilling sound. Muscovy can be very aggressive towards each other and other birds if they are expected to share their space with them, even the girls. One of our Muscovy girls would attack our son until we dispatched the male (he was people aggressive and nothing we did would make him change his ways). Once he was gone she calmed right down and is now fine.
This video is a good demonstration of the difference in sounds between the sexes.