I've got this DVD I picked up by Fiduccia (sp?)on calls. He talks about the can and about how many people misuse it.....in that if you turn it slow and give a long loud blat, that's actually an alarm blat and will drive deer away. He says there are several different kind of blats...for example an esterous blat was three short "whiney" blats with about 1 second in between blats and how you should couple that with a tending grunt....he gos though blats and bleats and grunts and blows...etc....