Another Avalung II Question

[H-man]

I have been using an Avalung I for about 4 years. I just up graded to an Avalung II.

I just tested it out and when I inhaled and exhaled, it hummed like a kazoo. Is this normal or is something potentially wrong? This did not happen with the Avalung I. I read the instruction pamphlet and it does not address this. Any body know about this?

Thanks.

[Dside11-11]

Mine does that too. I was just going to double my ROI and use it to call game in the fall.

The farting is the blowout valve flapping when you exhale and activate it.

[Incompetent Boob]

The only one I've seen does that too. Play it like a bagpipe in the liftline for super-gnar points.