 The early makers including Eichhorn (Schwyz) and Nussbaumer (Bachenbülach) experimented with different arrangements and numbers of buttons.The typical Schwyzerörgeli today has 18 bass buttons arranged in two rows (one for bass notes and one for major chords), and 31 treble buttons on the RH arranged in 3 rows with a fingering similar to the 'club' system.The basses progress in 4ths like the Stradella system seen on chromatic and piano accordions, but in the opposite direction.