try the links....they should help
http://www.gameandfishmag.com/ducksgeese/gf_116201a/
http://www.duckcallers.org/calling.html
http://www.takeem.com/duck_calling.htm
http://www.ducks.org/waterfowling/ca...lling_tips.asp
http://home.kc.rr.com/greenheadcaller/index.html
If these links don't help you along, you're in big trouble.Click on the Carlsons link and you'll find a great free download.Remember....practice,practice,practice

P.S.
Winglock makes a great double reed call
http://www.winglockcalls.com/index.html