i used to do the lip thing, but i began to practice gurgling water. put the call in your mouth normal. however your call is positioned when doing your yelp, position the call for the purr the same way, then practice vibrating your throte, like you are trying to sound like a car engine. not with your lips! with your throte. now do the same thing with the call in your mouth. let the diaphram be loose when doing this and you will get a smooth, nice, peaceful purr that will make a gobbler go nuts! i don't like to flutter my lips any more becuasemy face mask will get soaked with slobber and becuase the gobblers can see the movement of your lip through your face mask. it took me probably a total of 10 hours of practice to get it down throughout the month. just remember, practice and you will get it.