Just take your deer call and do a grunt. then imitate it with your own vocal chords. doesn't take to long, you get the hang of it. I can grunt, and bleat. Deer vocals are as different as human voices. doesn't seem to matter what pitch. What I find is: when a deer is ready to respond it will respond to just about anything. If the deer is not ready to respond he won't respond to that 20 dollar deer call either.

good luck grunting and bleating.