I hear just as many hens that have that throaty, clear yelp (wingbone or trumpet) than all that nasty rasp. But either way,..It's all great music to me

Listening to Live turkeys and TTT , the bulk of the plain yelps are much as you described, clear front rolling over to slightly lower tone without a bunch of rasp..
Pat, I totally agree-I have been working my tail off practicing and "tweeking" my calls to carry that front note a little more noticeably in each yelp note.
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You do that and the judges recognize it, you should score through the roof.. It seems alot of guys will hold it for a yelp or two and than whether its nerves, volume or whatever they lose the distinction in the high note.. They still have a front and back with rollover but the front end is hard to pick out..
If my memory is correct, Denny Gulvas does a very good job of keeping that front note in there..