I'm brand new to accordion playing and bought a refurbished bayan, and I've fallen in love with it. I've noticed, however, that when sounding the bass B key, there is a somewhat harsh rattling noise in the instrument. On occasion, air will also escape past the B reed, causing it to sound even when I'm not pressing any buttons. The button itself is not jammed down either. I'd rather not have to bring this to an expert if this is a somewhat common problem, but I know very little about the interworkings of accordions.