CHROMATIC PIANO ACCORDION Free bass accordion. New 2019 model. Black bellows, keyboard with SILENTKEY system. The Bravo I 49 F is the lightest accordion in its class, and the best way to get started in the world of bass tunes. A free bass accordion allows you to play melodies in the bass with your left hand. With the Bravo I 49 F we offer you a first approach to the exciting world of the most advanced musical styles. The Bravo I 49 F has been designed in close collaboration with music teachers, in accordance with current teaching standards.