A lot depends on how much ground I have to work, and what I am trying to accomplish. If I am making a run across big ground, like a large western state, I will call at more volumne and continuous. I may travel a couple of miles between stands and if I make enough stands I am going to find someone in the mood to respond. If I am working ranches or ground that is smaller, and I am going to be hunting that ground much, I call small. In other words I don't make many loud stands trying to cover lots of ground with the call. I may only call loud enough to wake a bedded coyote in a single piece of cover, and I may sneek within yards of that cover before calling. Many coyotes these days have heard a lot of electronic noise, and many will run from calling or just ignore it, that includes howling. It seems odd but years ago I started with a mouth call, went electronic, then digital, but now find myself back on the mouth calls. I feel I get a cleaner sound, and the coyotes often respond better. Not to talk you out of electronics, I still use them, just don't expect miricles. I also find myself glassing more these days and calling less. I pack two guns if I am using distress sounds. A rifle and a shotgun with 3" #4 buck, and a very tight choke. The other thing, just because you kill one, don't stop calling or think it is over. Many coyotes are in pairs or larger groups and if you get one close expect another. They may be hung up at a distance, but that's what the rifle is for. When you are done calling, glass before you move.