I carry two of each, two glass, two slates, and two boxes and two cane or trumpet calls. One in a high pitched young hen and one in an old raspy hen. If I strike a bird up with a call I'll keep using that call until I pull the trigger on that bird, but if he hangs up and moves off I'll reposition on him and switch calls because there was something he didn't like about it that changed his mind. Every hen has her own voice and a bird knows each one of them in his area, so when a new bird (you) comes to his area he has to check her out if he likes her voice. I'm not affraid to try different calls to find the one he likes and I'll work him with it. You never know what sound he'll like and if you don't try each you'll never know. What works today may not work tomorrow and vise a versa, if the bird likes the sound of a call he'll respond asap so you don't need to call a lot with each call, but if you don't run them you'll never know.