You can Google turkeyhunter1972 on YouTube and there are several old friction tutorials I did when I was with Woodyhaven. They explain, how I yelp, cackle, Keekee and cluck purr. These are basically the same stuff that is written in that article.
Everyone has always thought the way I do stuff on friction is unorthodox, but it works for me. I just think that 99% of the people are wrong and Im right!!!! lol
Sadler