P.S. I don't understand why other call makers emphasize volume so much in their product descriptions?
Don't under estimate high volume! In open areas and wind you need more volume in a lot of circumstances. Even with little wind, in certain areas and times of the year max volume is a plus for sure. Coyote vocals and aggressive pairs, are 1 example where max volume pays off.
I'm a big believer in max volume for calling coyotes, if you work some open country and draws that are long and wide, sound can be eaten up a lot with even a 10 mph wind.
Max volume in my thinking and others I know is that with aggressive coyotes it demands a reaction or response, using the sounds that will provoke this is the key with a lot of volume.