I've played with alot of E-calls from $5.00 homemade to $500. top of the line, and they ALL call coyotes. I've run cassetts, CD's and Digital, they all work. I stll run CD's through a JS Converta Caller when the the situation calls for alot of volume and and I have alot of open country in front of me.
I've had pretty good luck with the little JS Attractor combined with a hand calls also.
AWS