If you aren’t sure how this tool can help you, watch this video on Coincidental Partials and Check Notes:

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If you want to learn how to tune a piano by ear, there are some skills you will need to have.

If you are weak in these skills, you will have great difficulty understanding what is needed to be able to get decent results tuning a piano by ear.

One of these skills is the ability to name musical intervals. If you want to learn to tune a piano by ear, you NEED this skill.

Intervals on the piano are not in tune. That is to say, because of the physics of music, we can’t have all the intervals pure.

A pure interval doesn’t beat. That is to say, there is a series of frequencies, called the partial series, that is created above each interval note when played. When one of those frequencies is the same as a frequency above the other interval note, there is no beating there, similar to an in tune unison. That’s a pure interval. And the partial that belongs to both interval notes is called the Coincidental Partial.

We use a third note, called a check note, to measure the relative location of each of these coincidental partials. If they each are located at the same place, we say they are equal, and the interval is pure.

The check note also allows us to accurately measure if the interval is slightly wide or narrow instead of pure.

The piano is full of these “slightly non-pure” intervals and our challenge is to set these intervals to the correct “non-pure” size so that all the intervals are “equally out-of-tune”.

To do that, we need to know:

• What is the partial series above each interval note?
• Where do these partials line up? (coincidenatl partials)
• What is the check note needed to measure and set the size of the interval?

The traditional way to do this involves years of music theory study so that all these intervals are memorized, until now.

Now, anyone can quickly and easily, and often faster than accomplished musicians, name any interval and check note needed to tune a piano aurally, in a matter of seconds, using this new amazing tool:

The Piano Tuner’s Interval Slide Rule

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Only $19.99 $24.99 and FREE SHIPPING!
But only until June 30th!