AGO Organ Maintenance & Tuning Basics 2 — Questions and Answers
Question 1: What is 'voicing' in the context of pipe organ maintenance?
- Adjusting the pitch of individual pipes
- Modifying the tone quality and volume of pipes by adjusting the mouth, languid, or toe hole (Correct answer)
- Replacing worn leather on wind chests
- Cleaning the pipe surfaces to remove dust buildup
Correct answer: Modifying the tone quality and volume of pipes by adjusting the mouth, languid, or toe hole
Voicing involves shaping the tone of a pipe by adjusting physical parameters like mouth width, languid height, and toe hole size.
Question 2: Which tool is most commonly used to tune open metal flue pipes in the field?
- A tuning fork and mallet
- A cone or roller used to open or close the pipe top (Correct answer)
- A screwdriver to adjust the languid
- A micrometer to measure pipe diameter
Correct answer: A cone or roller used to open or close the pipe top
Open metal flue pipes are tuned by rolling or coning the pipe top to slightly open or close it, altering the speaking length.
Question 3: What effect does high humidity have on wooden organ pipes?
- It causes metal fatigue in pipe feet
- It can cause wood to swell, potentially distorting pipe mouths or sealing joints (Correct answer)
- It lowers the pitch of metal pipes significantly
- It has no measurable effect on organ pipes
Correct answer: It can cause wood to swell, potentially distorting pipe mouths or sealing joints
High humidity causes wood to absorb moisture and swell, which can warp pipe bodies, distort mouths, and affect speech and tuning.
Question 4: In a tracker action organ, what is the function of the pallet?
- It connects the key to the pipe mechanically
- It is the valve inside the wind chest that opens to admit air to a pipe (Correct answer)
- It regulates wind pressure from the blower
- It is the wooden rack that holds pipes in position
Correct answer: It is the valve inside the wind chest that opens to admit air to a pipe
The pallet is a valve seated in the wind chest table that lifts when a key is pressed, allowing pressurized wind to enter the pipe channel.
Question 5: A pipe that 'ciphers' is one that:
- Speaks too softly to be heard from the nave
- Speaks continuously without a key being pressed (Correct answer)
- Produces a pitch a semitone too high
- Fails to speak at all when its key is depressed
Correct answer: Speaks continuously without a key being pressed
A ciphering pipe sounds continuously because its pallet or valve fails to close, often due to a stuck key, swollen wood, or debris.
Question 6: What is the purpose of the 'toe hole' at the base of a flue pipe?
- It allows the pipe to drain condensation
- It controls the volume of air entering the pipe foot to regulate loudness (Correct answer)
- It provides a tuning point for reed pipes
- It anchors the pipe to the wind chest rack board
Correct answer: It controls the volume of air entering the pipe foot to regulate loudness
The toe hole's diameter controls how much wind enters the pipe foot, directly affecting the pipe's loudness and speech character.
Question 7: Which interval is organ tuners most commonly required to temper when setting equal temperament?
- Octaves, which are widened by 2 cents
- Fifths, which are narrowed by approximately 2 cents (Correct answer)
- Thirds, which are tuned pure (beatless)
- Unisons, which are deliberately mistuned for chorus effect
Correct answer: Fifths, which are narrowed by approximately 2 cents
In equal temperament, each perfect fifth is narrowed by approximately 2 cents (1/12 of the Pythagorean comma) to distribute tuning evenly across all 12 keys.
AGO Organ Maintenance & Tuning Basics 2
What is 'voicing' in the context of pipe organ maintenance?