The number of buttons on the bass keyboard describes the size of an accordion. Sizes range from 8 up to 120 bass. As the number of bass buttons increases, so does the flexibility of the accordion because repertoire becomes less restricted because there are more notes.
48 bass accordions are often considered a good beginners size, particularly for younger students since they are very compact, lightweight and easy to handle.
72 bass is a good mid-range size. Ideal for adult beginners, they are lightweight and compact although, may restrict your repertoire.
96 bass accordions offer many of the features of a fully specified 120 bass instrument but in relatively lightweight and compact size. They offer great scope and flexibility.
120 bass full size accordions are the most flexible offering features that are not commonly found on smaller instruments.
There are two bass systems, either or both of which can be paired with a piano or button treble keyboard.
The most widespread and popular, Stradella bass is an ingenious system which allows you to play all styles of accompaniments, complex chords and melodies.
Comprised of up to 6 rows of buttons, the 2 rows nearest the bellows play single notes over a range of 12 semitones, the remaining rows producing fixed chords (major, minor, seventh and diminished).
Despite its clever design, melodies may not always sound at true pitch because of the limited range of single notes.
The layout is the same on all sizes of accordion.
A system of singles notes arranged in a diagonal chromatic pattern. Having a range of several octaves, it allows melodies to be played on the bass at true pitch. For this reason it is sometimes referred to as the “classical” bass system.
Like chromatic button treble keyboards, there are several different layouts available.
Combines Stradella and Free Bass systems into one allowing you to have both systems in one accordion!
Pressing a switch “converts” the Stradella bass chord buttons into the single notes of the Free Bass system.