Piano Keyboards with Pythagorean Tuning.

It is a Piano-Keyboard by Pythagoras tone.
It is based on A so that it can be used for pitch confirmation of violin and so on. The numerical values written on the keyboard indicate the difference with the average scale in cents. The pitch of each keyboard is computed with a frequency ratio of 3: 2 based on A, and it is supposed to be a pitch within the octave.

The following functions will be available depending on the charge item.
● Frequency change of A (from 400 Hz to 500 Hz)
● Change the sound (distortion) to make it easier to hear.
● Button arrangement in the fifth sphere table (you can play chords)
● The pitch can be changed to + 1 octave, -1 octave