morning genie!

i had a kazoo many years ago.

the diaphragm seemed to be made of some sort of very close weave synthetic textile fabric, a bit like very thin shower curtain material.

i guess for the diaphragm to make a satisfactory noise, it'd have to be made of something very supple. have you tried that thin rubbery stuff that balloons are made of?

you know if a blown up balloon is deflated by stretching the neck with your fingers, it makes a very loud wailing, shrieking sound.

regards,

mr h