Jay, Just remember that some of these calls reqiure blowing from the bottom of your belly. diaphragm etc. Blowing into one like a whistle won't create the sound your looking for. I found out that saying or humming words give off better sounds for me. so practice. good luck in your search and keep us posted on your success. I got Primo's Yo SISTA, and also a Primo: 6-in-1 whistle call.