THE CLEAR FRONT NOTE OF THE YELP?

I been watching alot of videos on you tube on turkey calling trying to listen to see what i got to sound like for this contest.I came across a scott ellis video about the yelp.He did a demo how must people yelp on a mouth call.It was all rasp no clear front note.I looked at some of are videos we taped and i will admited i'm gulity of it.Thanks to the video may yelps are alot more relastic.I just slide my tongue to the right and bam super great yelps and if you want do the first few clear then slide your tounge back for rasp at the end.I called and killed birds with just the rasp but now i can probably sound like a flock of birds.The call i use is super raspy but with the tounge in the right spot and enough pressure i can do some great kee kees also.