I started with just playing around mimicing the calls. Once at work a guy was using a mouth call and I threw a call back at him, he accused me of having a call in my mouth, didn't know i was that good. Since that time I have been practicing with purrs, changing tones etc and I think I got a good veriaty. A co-worker has taught me to gobble, basically say gobble, gobble really fast. I have not mastered that yet.

Anyways I am going to try it this spring.