ok guys

I picked up a package of 3 mouth calls, its the H.S. Strut 3 pack i came with a Single D, Double D, and Split v II. it was cheap like $10 so i got it cause i wanted to start practicing early to be flawless for this upcoming spring. i have found the easiest to use was the Split v II then the double d andthe singlev just a B1tch to use. In the package there were no instructions on when to use each of the calls. can you help? GameHunter is picking up one of the slate calls and I think tha one of our other buddies is gettin the push button so we can have the necessary calls at the necessary times. also why do crow and owl calls work good for locators?
Thanks
Tyler
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All Americans believe that they are born Fishermen. For a man to admit a distaste for fishing would be like denouncing mother-love and hating moonlight. -John Steinbeck