Chuck,
Another thing, on top of the other advice offered, is to learn to regulate your call volume. When I learned to call, nobody bothered telling me about this. If a tom gets inside of 100 yds, screaming at him ain't gonna help! Ya gotta seduce him...call softly. Putts, purrs and soft yelps work best for me...Think back to those little gals in school that kinda ducked their heads and cut those big doe eyes at ya, all the while murmurring under their breath. I don't know about ya'll, but I always had to get closer to hear what she was REALLY saying. Same thing with the gobblers.
PS: The last little gal I listened to, like the above description, I married! Been almost 30 years now. She still mumbles under her breath while cutting her eyes at me. The look and the tone/meaning of the mumbling ain't like they use to be though!
HWD