As described previously, the reed rank is a kind of wood harmonica on which reed-fitted plates are laid.
When air flows through the rank in the right direction, the reed vibrates.
Each button on the accordion is connected to a mechanism which allows one or more pallets to be lifted.
Pressing a key on the fingerboard raises the pallet and allows air to flow across the reed.
|figure 1 - no sound produced|
|figure 2 - air reaches the reeds|