As seen in the last diagram of the last lesson,
when a unison is out of tune, the higher partials beat.

Click the [Out of Tune Unison] button below
to listen to an out of tune unison.

You may be able to hear some beating,
but can you hear each of the higher partials beating,
at a different speed, at will?

That is one of the most important skills of a good aural tuner.

That is what you HAVE to learn to do
if you want to learn how to tune a piano by ear.

Click each of the [Partial #] buttons below
to hear a filtered recording of the out of tune unison above,
with the first eight partials filtered out.

Then click the [Out of Tune Unison] button above,
and try to focus your ear on specific beating partials.

EXERCISE:

Click the [Partial 5] button below.

Listen to the frequency and speed of that specific beat,
then click the [Out-of-Tune Unison] button below and
try to hear that same beating partial.
within the full sound of the out-of-tune unison.

Do that with all the partials.

You should be able to clearly discern
the first five partials within the out of tune unison.

[tcb-script]//WAVEFORMSvar outOfTuneUnison = "https://howtotunepianos.com/wp-content/uploads/2016/10/ETAA4OutOfTune.mp3";var partialEight = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialEight.mp3";var partialSeven = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialSeven.mp3";var partialSix = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialSix.mp3";var partialFive = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialFive.mp3";var partialFour = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialFour.mp3";var partialThree = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialThree.mp3";var partialTwo = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialTwo.mp3";var partialOne = "https://howtotunepianos.com/wp-content/uploads/2016/10/PartialOne.mp3";//FUNCTIONS function playOutOfTuneUnison(){ //Define the two octave wave files to be played track1 = new Audio(outOfTuneUnison); //Play the two wave files simultaneously track1.play(); }; function playPartialOne(){ //Define the two octave wave files to be played track1 = new Audio(partialOne); //Play the two wave files simultaneously track1.play(); }; function playPartialTwo(){ //Define the two octave wave files to be played track1 = new Audio(partialTwo); //Play the two wave files simultaneously track1.play(); }; function playPartialThree(){ //Define the two octave wave files to be played track1 = new Audio(partialThree); //Play the two wave files simultaneously track1.play(); }; function playPartialFour(){ //Define the two octave wave files to be played track1 = new Audio(partialFour); //Play the two wave files simultaneously track1.play(); }; function playPartialFive(){ //Define the two octave wave files to be played track1 = new Audio(partialFive); //Play the two wave files simultaneously track1.play(); }; function playPartialSix(){ //Define the two octave wave files to be played track1 = new Audio(partialSix); //Play the two wave files simultaneously track1.play(); }; function playPartialSeven(){ //Define the two octave wave files to be played track1 = new Audio(partialSeven); //Play the two wave files simultaneously track1.play(); }; function playPartialEight(){ //Define the two octave wave files to be played track1 = new Audio(partialEight); //Play the two wave files simultaneously track1.play(); }; [/tcb-script]

Lesson 7 – What is an Out-of-Tune Unison?

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