I wont say they are doing you any harm , or any good .
I have tried useing crow sounds many many times and have yet to ever have a coyote respond to it .
BUT im on the east side . I have talked to a few of my friends that are excellent callers and they have had the same results.
I have read posts on some diffrent web sites that have claimed the crow sounds are very productive and have sealed the deal for some callers .
It would seem to me it would be a great attractor , but i have yet to experiance that .
I have seen crows dive bombing coyotes out in the sage , so i always keep an eye on them and the magpies when they fly near one of my stands.
If sompthing changes and they do help, be sure to keep us posted . Jerry .