What is the register key for clarinet?

The register key on a Clarinet is a mechanism that enables the player to switch between the lower and upper registers of the instrument. When pressed, it allows for the production of higher notes by directing the air flow and altering the pitch. This key is typically located near the top of the instrument, and its function is crucial for achieving a full range of notes. Mastery of the register key is essential for clarinetists to perform effectively across various musical pieces.