Button accordion

The knob handle accordion, button accordion (English button accordion - BA) differs from the piano accordion (piano accordion - PA) primarily through the keyboard in the treble. The term knob handle accordion is used colloquially in the German language very often for the chromatic button accordion ( chromatic button accordion - CBA ) is used, although the term course refers to all types of accordions that have buttons, and thus also the diatonic accordion ( diatonic button accordion - DBA) includes.