I highly recommend the Denny Gulvas video. I like to do the kee kee run of a jake and coarse 2-3 note yelps or sharp clucks on a glass call if I know gobblers are in the area. you basically want a deeper more resonate tone when doing gobbler yelps and clucks. Kee Kee run is just "peep peep, yawk, yawk, yawk" They will respond to plain old hen yelps and clucks as well. Their not as vocal in the fall but can still be curious. 9 times out of 10 they come in silent or cluck right before you see them.