These pages comprise a dictionary of terms relating to the pipe organ. Please keep definitions to a few sentences, and do not include pictures or sound clips. When more space is needed for a term, a new page can be created for it. Cadereta [noun] - in Spanish organs, the Ruckpositiv or chair organ, placed behind the player's back. Calcant -- In hand-blown organs, the signal device from the performer's area to the person operating the bellows to begin working the bellows or to stop. Frequently in the form of a stop knob. Case Casework Chest [noun] - short for "Wind Chest". Closed Closed Shallot Cone