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21 + 5 accidental treble buttons.
3 voices with three stops allowing 5 different sounds :
- 1 voice : concertina (single medium reed)
- 2 voices : double medium reeds
(dry, swing or musette, according to voicing) 
- 3 voices : double medium + single low octave reed
- 2 voices bandoneon (single medium + single low octave reed) 
- 1 voice : single low reed
12 basses with 2 stops :
- 1 stop to remove the third from the chords,
- 1 stop to remove the low reed from the bass.
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