CHROMATIC BUTTON ACCORDION From French Musette to Russian Folk, the HOHNER MATTIA IV 120 Button is made for all advanced and professional musicians. Its cassotto accordion design in combination with the continuous angle acoustic system offers a unique sound experience for the audience and the performer. Our HOHNER chin registers, made in Trossingen, make playing the MATTIA very comfortable thanks especially to the dual-shift option. C-stepped, black color.