Inside the accordion are the reeds that generate the instrument tones. These are organized in different sounding ranks, which can be further combined into registers producing differing timbres. All but the smaller accordions are equipped with switches that control which combination of reed ranks operate, organized from high to low registers. Each register stop produces a separate sound timbre. See the accordion reed ranks and switches article for further explanation and audio samples.
The accordion's body consists of two wood boxes joined together by the bellows. These boxes house reed chambers for the right- and left-hand manuals, respectively. Each side has grilles in order to facilitate the transmission of air in and out of the instrument, and to allow the sound to better project. The grille for the right-hand manual is usually larger and is often shaped for decorative purposes. The right-hand manual is normally used for playing the melody and the left-hand manual for play