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. Kegellade Chest (German) -- Cone chest. Keraulophone [noun] -- A flue stop appearing frequently in larger instruments of the late 19th-early 20th centuries. The typical version was medium-scale, with a tone like a stringy or horny diapason. Often found as a solo stop. Early builders used this name for other types of stops. Key Key Channel Key Pin Keyboard Knee-Lever