Most times just a good spread for geese will work and a few quacks from a duck call will suffice. If the ducks are not committing, put a few decoys around your blind to get them in close and it should be all good. In that situation a goose call works better than a duck call to get them coming, but a good duck call to finish them may just put them in your face and then it is pandimonium
In that case don,t forget to pick a bird to shoot, instead of trying to flock shoot or you may come up with nadda
Happy Hunting.
P.S. Nothing is for sure but a little experimentation on your set ups will help you get it right sometimes