Technical parameters and performance of keyboard accordion Keyboard accordion is divided into three parts: keyboard, bellows and bass. According to the structure of accordion, it can be divided into traditional accordion, four tone accordion and free bass accordion. （1） Keyboard: it is a basic tone sequence composed according to certain interval relationship. It can play the high, middle and low tones of melody. The keys are arranged in order and move flexibly. The sinking depth of white key is 4-4.5mm, and that of black key is 6-6.5mm The maximum load of the piano key is 0.83n when it is still. The pressure of 1.27n can make the key sink to the bottom. The height difference between the two adjacent keys is 0.5mm （2） Bass: according to different specifications, accordion bass part has different number of buttons. The surface height difference between the two buttons of bass button is 0.5mm （3） Bellows: it is the sound produced by stretching and compressing the air pressure, which makes the reed vibrate freely. The two ends of the cloth stick on the surface are neat, and the folded edges are neat. The air leakage is not more than 98pa, Sound part: pitch is based on 440hz of small group a tone. According to different specifications, there are treble, middle tone, bass, wave tone, spring voice is sensitive, opening size is appropriate, wind wave is not curved, etc., the pitch error of two adjacent keys is not more than 5Hz Accordion is produced and sold in accordance with the industry standard (QB / 1996-2021) of the Ministry of light industry of the people's Republic of China

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