Bass Accordions -

They typically use multiple ranks of deep reeds (8', 16', and 32') to provide the "foundation" sound for an orchestra, similar to a double bass or tuba.

Typically include "Counter-bass" (major thirds), "Fundamental bass" (root notes), and then columns for Major, Minor, Dominant 7th, and Diminished chords . Bass Accordions

High-end professional accordions often feature a "converter" switch that toggles the left-hand buttons between Stradella (chords) and Free Bass (melodies) modes. 2. Specialized "Bass Accordions" They typically use multiple ranks of deep reeds

The most common system. Buttons are arranged in rows and columns based on the Circle of Fifths . "Fundamental bass" (root notes)