Guys it is all about the body language, obviusly you would'nt maaa at him if he wasacting spooky but if he is just casually walking a trail and it looks like he might not stop a soft little maa would suffice just fine, if he's hauling assafter a doe during the rut do whatever you can whistle whatever to get a shot, odds are you might not ever see him again. you have to be able to judge body language.