French

The plein jeu or "full registration" is a combination of stops indicated in French organ music of the 17th and 18th centuries. It consists of all principal stops at the 16-, 8-, 4-, and 2-foot pitch, as well as the mixture stops (upper harmonics), with the positif manual coupled to the grand orgue. This means that for any note pressed, the organ sounds the following pitches: one octave below the given note, the note itself, one octave above, two octaves above, and a combination of octaves and fifths above that. This combination was commonly used in the opening movements of hymn and mass settings.