I have used the can,but cannot say it has helped me.I also cannot say it has hurt me.I did find that when you get cold,turning it over causes it to stutter,sounding un-natural.I tried blowing in the single hole and found it will more easily make natural sounds.One thing I don't like about it is the way it jingles from the sliding piece inside.Knowing it will make natural sound by blowing in it,I am going to modify mine by adhering the two pieces together.Always tinker,somtimes you'll hit on a winning combo!

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