Hello everyone, I have a "gurgly" G bass note only in the outgoing position of bellows. This noise occurs on all shifts on a 4/5 reed piano accordion that is about a year old. A Serenellini Regina Gold. I'm guessing a reed valve out of position?...or maybe a piece of dust or sawdust from construction? I was thinking of blowing low pressure air through the reed blocks. If I play the accordion for 30+ minutes it goes away sometimes. Thoughts? thank you.