Téthys

Téthys accordion open
Téthys accordion closed
Characteristics: 

21 accidental treble buttons, 3 voices, instrument with 5 couplers, located behind the fingerboard, allowing 5 possible 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

8 basses with 1 stop to remove the thirds.

Dimensions (L x w x h) : 25.5x17,3x30 cm
Weight : 4,1 kg
Reed type : Tipo a mano