i have a "crystal" freak, not the frictionite version. The surface is extermely hard and takes awhile to sand to get good sound. The thing I do not like about it is the gravedigger striker they give you with it. It is very dull sounding. I used a different striker from a Lohman call I have and it sounds great and very loud!!!

Rough up the surface real good and then practice. I found friction calls to be easy to learn all calls with.

Yelps- do small circles and drag at right time to get yelp sound--practice until it sounds right
purrs- lightly drag striker across sand lines
cutts, putts, clucks- like striking a match. pressure is only difference for each

My buddy says he even heard a pro gobble with his at a turkey show in Columbus, OH recently.

always keep striker on surface!!!