Below is a brief explanation for readers' reference. The sound is very accurate and can be viewed from two perspectives: the scale and the focal length of the sound. The scale part is relatively easy to understand, referring to the height of the sound. On the violin, the height of the sound is determined by pressing the strings with the fingers. The accuracy of the scale is not related to the performance of the violin, but mainly depends on the user's proficiency. It is difficult to explain the focal length of sound. When sound is produced by a violin, even if it is a single tone, the content of the sound is very complex. For example, green can be modulated from blue and yellow. If you compare it with green in a paint can, the modulated green will be more meaningful and vivid, while the green taken directly from the paint can will be dull. The sound of a violin is like color, and if modulated properly, it will be expressive. If too many colors are used, it will lose its color saturation and become dull.

There is no single note in a violin that is simply shaken. They are composed of several different pitches, which are like several different colors, singing together to modulate the sound we need. When the colors are not coordinated, the sound will be cloudy, sometimes severe enough to lose color and become gray. On the contrary, if the coordination is appropriate, the sound will be rich in color, with clear focal length and a brilliant sound, like standing in the center of a magnificent palace, with one's own figure reflected on a painted wall, rising from the soles of one's feet with satisfaction all the way up. If color is lost in the pronunciation of high pitched strings, the sound will become thin and sharp, and if color is lost on low pitched strings, it will appear dull and unenthusiastic (this situation is often seen). Usually, violins tend to neglect one aspect in production, with rich high pitched content and dull low pitched sound, making it very difficult to achieve an average tone. The focal length of a violin's sound can be verified during the tuning process. If the player frequently uses a five degree tuning and plays two strings simultaneously to listen to the sum of the two strings, a violin with a more accurate focal length will easily hear the sum. Otherwise, it will lose its precision and become blurry.