I will say that the best responses I have had with my trumpet is super soft stuff, the softest/quietest I can play it. I also have found that a few clucks with maybe a pleading yelp or two has worked best. I do play 1-handed 99% of the time and have found it pretty easy to get the soft stuff this way. There is always the exception, and I have called in birds cutting loudly and yelping aggressively on a trumpet too. A few days ago I was calling softly/sparsely on the trumpet when I heard a hen yelping, she was only 40-50 yards away and I could barely hear her. She was only letting out 2-3 yelps at a time, super soft, no clucks, and my immediate thought was how similar she sounded to a trumpet. This was public land that hens are typically very silent on so it was cool to listen/watch her.