The thing about mouth diaphram calls is that no two sound the same. You can get several that are identical and each one will have a little different pitch to it. The latex might be stretched a little tighter or just the way each one fits into the roof of your mouth although most of us "fit" the call to our individual tastes. You never know what will get one going. A few years ago, I took a guy out that had never gone before. I even loaned him one of my turkey guns. We went out for two days to my favorite spot that I have never seen another human in. I used my favorite call the first day. It sounded good too, but it was one of those days when I never heard a gooble. I never heard anythiing at all. The next morning, we were back in there trying to get one roosted in the dark and right when it started getting light but never got one to answer any of my locator calls either. I knew the birds were in there, but they wouldn't talk. I started using different mouth calls that I had confidence in but never got a reply from a gobbler until I made a mistake and picked out the wrong call. I thought it was one of the calls I had used erlier as it was the same color and had the same looking reeds but it wasn't. This one sounded bad. I mean, really bad, not like any turkey I ever heard. It was low pitched and so raspy it almost sounded like I was trying to spit instead of yelp. Strange thing was, I got a gobbler to answer it immediately from across the canyon. I yelped again and then realized that it wasn't one gobble I heard but several gobblers all gobbling at once. I continued this as they came closer. All of the sudden another one gobbled behind us. This one came in really fast and gobbled every time I yelped on that nasty sounding call. The guy I took with me killed that gobbler in full strutt at about ten feet. As I was shaking his hand, the other gobblers gobbled at us one more time really close, so I yelped with that nasty call again a few times and here they came.. there were five or six gobblers and all came in at one time. The dead bird started flopping around at that same time and the other gobblers almost ran over the top of me trying to see what was going on. I guess they thought the flopping was that other gobbler mating a hen and wanted to check it out. I killed one of those while they were at it. It was one of the coolest times I ever had during a turkey hunt and if I hadn't made a huge mistake and got the "wrong" call", I don't think we would have gotten anything. It also proved that what I thought sounded good wasn't what the gobblers thought sounded good. The call was a "raspy old hen" call. I tried that call many times since then and never again got a gobbler to answer it. Strange, but that's how it works and why so many of us bring so many different calls with us. That doesn't mean that we'll be smart enough or lucky enough to pick the one that'll do the best, but we try.