Step 3: To blow the call, put it to your mouth with the cutout facing up. Your bottom lip should touch the bottom edge of the latex, while your upper lip lies on the edge of the lid. To cluck, make a short tut sound. To yelp, make the same kee-yuk sound you would on a diaphragm call. With some practice you can make good purrs and kee kees as well. Tune the call by tightening or loosening the latex, or by increasing or decreasing the size of the gap between the edge of the latex and the bottom of the cutout.