In my opinion,
Every bird has voice---whether high or low in pitch---"people" including me at one time,thought there were clear yodels from geese and raspy yodels from geese---but after studying live yodels---what I thought was "clear" still had voice---just at a much higher pitch and sharp---they seem clear and high from far away,but they still have voice
Listen the next time you call in a single and he passes over when close and lets out a yodel overhead---you think,wow,there is rasp in that sound,he sounds dirty
So,learning how to put voice into your calling can be beneficial
as far as double clucking---yes,nice to be able to do to add urgency to plea on birds that wont break,BUT good solid single clucking done from low to high then back to low in one little "hill" can be very effective---the KEY is to go back down the hill after hitting the peak---if you cluck up and stay up and stop---VERY close to alarm sound---take home point---let the sound of the cluck run back down---ramp it up,but always let back down
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