Being a semi-professional Kazoo player I can say this is average the bevel goes in to early and the it takes a full hum to get anything. I think it is due the the diameter of the output it should be a 22mm with a 19mm finely waxed filament positioned and placed with the correct measurement to allow it to resonate. The intake port is about right though lacking a full incisor grip or grip ridge is disheartening. The exhaust port could use some modification and the resonator cap is nice with common flange at top.
Did not care for the lower part to be made of plastic but does add to the sound of the instrument.