You may call in more coyotes if you do not start with the coyote locator sound.
I use distress sounds most of the time and let the sounds play continuously. Lightning Jack, Jack Rabbit Distress, Adult Cottontail, DSG Cottontail, Bay Bee Cottontail, Snow Shoe Hi Pitch, Prairie Dog Distress, Adult Rat and Vole Squeaks. All of these sounds work great for me and there are no Prairie Dogs anywhere near the areas I hunt.
I do raise and lower the volume during the stand.
Playing Coyote Pup Distress 3 on full volume for 3 or 4 minutes at the end of a stand has also called in quite a few coyotes for me.