Except . . .
A couple years ago I was working my way down a little valley, hit the crow call every so often. I was about 3/4 ways through the valley and hadn't heard a thing. Then, a group of Canadian geese flew down the center of the valley making a racket. A turkey gobbled back behind me where I had just come through. Sometimes, I think, it takes a little more to get a response. Now, what I do when using a locator call is give it a short blow first, then, sometimes, follow it up with a longer call if I don't get a response on the first one.