What is this: Bandoneon or Chemnitzer: in General Concertina Discussion Posted January 17 Ok, I finally fixed the old 55 button bandoneon and it is playing again. I replaced a few gussets and patched some leaks in the bellows. I made 16 buttons (thanks to instructions from Harry Geuns in Belgium) I replaced one broken reed tongue (Harry sent me a new one.) Then I replaced the leather pads on the left side (but it is still leaking some air on the left). What an interesting instrument: It is basically an Anglo with rows of chords in G, A and E, and then a lot of other accidentals.