Videos or DVD sare much better than cassette tapes because you can see the hand positioning. This is especially true on short reed calls for geese, but also apply for flutes and duck calls.
I know the MN Waterfowl Assn has a CD out, they are listed in the conservation forum, go to their website, and look for the Calling CD.
The Audacity of Bull Crap.
"Typical: Gun-loving, bitter bible-thumping white person" Barack Obama.
Hey I resemble that comment!!! Those are FIGHTING WORDS!!!