There could be a few reasons why it might be silent. Don't cover the first hole. Look at the leading edge of the first hole. If this is not sharp it might take more effort to blow. You can try to take some acetone on a q-tip and give it a quick rub to shape it. When blowing it I like to cover the end hold and give a quick breath, while simultaneously releasing my finger on the end hole to get a rising note.

Try to print with more infill.

for the Funky 3 Tone Whistle

http://www.thingiverse.com/thi...

I print it two times. The 1 one didnt work because off less filling.

lol neither answered your question. i'd imagine there is no difference

The higher pitch note is meant to replicate the sound of the teal duck, and the lower note is the pintail duck. Yes, not for hunting.