Rat , all mouth calls work the same way, Horse shoe opening out, longest reed to the top or Tab down , place it half way on your tongue and then put your tongue onto the roof of your mouth , take a deep breath and go HECK. Once you get that high pitch , keep the note for a few seconds. Now if you take and lower your Jaw as you have that same note , the pitch will drop keeping a steady flow of out going air. The yelp is 2 notes 1/ high and 1 / low put togeather faster and you got the turkey yelp...BT