hunting buddy, i learned how to yelp and cluck in one day, it really was pretty easy for me after trying for a year with no luck. I went on you tube and found some guy giving instructions that made all the difference. Basically, place the call in your mouth with horseshoe open facing foward, apply pressure with your tongue while you blow air out of your throat (akin to clearing phlem from a bad cold, huuuhuuum sound), when you do this try to make a continuous high pitched tone. Once you've got the note relax your jaw and tongue slowly until the pitch lowers. There will be two lower pitches; one that is a dischordant two note sound, then lower to a consistance lower tone. The higher pitch to the lower pitch is the basic progression of a "yelp". Once you find the pressure differences b/t the high and low note you slowly increase the tempo at which you start and relax your jaw, your tongue will follow. The cluck I keep my lips closed until my cheeks fill with air then relaxing my lips in a "pluck" motion I've got a cluck. Seriously, I was able to do all of this in a matter of minutes. Now, three weeks later, I yelp, cut, cluck, purr( same as with gargling with a little air pressure, this took a few days to get), crow call, and I've been working on trying to emmulate a gobble. Sounds like jake with a cold. Hope this helps, it did me. Or you can to go toyou tube and search, i think, i used turkey sounds-how-to or something like that.