LOL - I taken a few, but when it comes to calling it tends to be a pitch that can be the game changer. To start the comment above of "They Have to be there to call them in" is the Most important rule in Coyote Calling. If they are not there, You nor any sound is going to bring them in like it or not. 2nd keeping in mind that you have played the wind proper and " You have Right ? " and got to your setup without being detected is the next most important thing. 3rd Requires Taking their temperature with a sound. Starting low volume according to the wind if any, to see if there is any close coyotes. You don't want to Scream at them to start with any sound. In this step I like to use Cottontail distress to start on low and work the volume. I then will start changing it up after that and as well increasing the volume. If they are farther away they are going to need more volume to hear the call. Excitement in a distress call to me is important along with volume. Remember Volume will travel in the open but not so good in thick cover. Changing sounds on the sets at different days is also a good idea. You don't want them to get used to the same sequences everytime you go in to hunt the place in general. 4th Movement is up most important, watch with your eyes and move your head slow. If they catch you at 100 yds or more out they are gone before you see them.
Smart Coyotes will hang out and watch and listen to the caller. They are not coming any closer so you need to be able to take distance shots at times. Hunting Coyotes with snow on the ground is far easier to see the animal. This also helps not to make the coyotes smart at your hunting spots. Only you know your areas and if you can see 90% of the area well when calling you should be ok, but if your hunting on level thick area with no snow, your making them smart. This is the very reason I do not hunt coyotes much before snow falls...
A little tip from my humble opinion, Just because you don't have the animal that the distress is coming from don't mean the Coyotes won't come to it. We do not have very many Jack Rabbits but I have killed more coyotes with that call then any of the 130 calls I have on the unit.
Good Luck Yotein !