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Due to the nature of the program, there may be some beats even in consonant sounds.
The sound of two or more notes that ring at the same time is called a chord.
Depending on the harmony system, a chord can be a consonant that gives a feeling of relaxation or dissonant that is uncomfortable to hear.
In the traditional Western harmony system, chords are made by stacking third-degree pitches. Thus, the basic triad is made by stacking two third-degree notes in succession (as a result, the lower note in the normal position, and the upper note form a fifth-degree note).
When hit the 'Do' on the keyboard,
When 'Do + 'Re' is pressed, the nodes at both ends do not match. In this case, a beat occurred and became the dissonant chord.
When 'Do' + 'Me' is pressed, the nodes at both ends match each other. There is almost no beating, so it sounds clear (third-degree pitch).
In the case of 'Do' + 'Sol,' the nodes at both ends match (5th pitch). There is almost no beating, so it sounds clean.
Raising one octave
You can see that there is a relationship between the two notes that make up a chord:
Frequency of 'Do' : 'Sol' frequency = 2 : 3
In other words, there is a simple integer ratio between the chords.
However, the integer ratio does not hold between dissonances, which is the cause of the beat.