-
Sub-New Feature
-
Resolution: Incomplete
-
Normal
-
None
-
None
-
None
You can see it described in the the piano accordion Wikipedia article, as well as under the 'piano accordion' bullet in the main accordion article: https://en.wikipedia.org/wiki/Accordion#Right-hand_manual_systems
Description: The bass accordion is a variation of a piano accordion which lacks bass buttons and has the piano keyboard an octave lower than usual.