Mutations

A 1 1/3' stop sounds the pitch two octaves and a perfect fifth above the key being played.

This is the nineteenth, the sixth partial or harmonic, and the fifth overtone.

Like the 2 2/3' stops, 1 1/3' stops are referred to as fifth-sounding stops; that is, they sound the note name at some fifth above the key being played.

To locate the sounding pitch:

• On one manual pull a 1 1/3' stop only and play tenor C. Remember this pitch.
• To locate the actual sounding pitch: on another manual, pull an 8' stop and play the key two octaves and a perfect fifth above, which is three G's above tenor C.
• This pitch (not necessarily the tone quality) should match the one you hear when you play tenor C with only a 1 1/3' stop pulled.