Au hurt that requires probably correct exercise. I sound right now more like a dying swan as how the Great Tits whose chirping I wanted to emulate. But still, I get out tones. I hope my neighbors do not call the SPCA because they believe in me dying animals ;-) However: ordered by eight pieces seen only three ever the same as on the manual, all other lacks the protruding uh Dings, the membrane on one side (?). I hope this does not diminish the functionality.