What are the techniques for shaking the accordion bellows?

As for the bellows shaking box, let me talk about the two types that I know and commonly use.

1. Shake the bellows back and forth: the music feels like short bursts of sound. This method requires you to hold the bottom of the bellows and use only the heel of your left hand and wrist to drive the upper part of the bellows to open and close quickly in a short distance. The bellows are shaped like a fan.

2. Vibrating bellows; the music feels like the echo of a bell after ringing. In this method, open the bellows normally and make slight flickering movements with the wrist of your left hand.

Uh... I don't know how to describe it in written language or more rigorous and accurate language. Anyway, that's it. Shaking the bellows is a skill that requires more practice. You can start slowly. Start practicing and then gradually increase the speed. Of course, you must be able to ensure that each note is even. It is recommended that you also watch more videos of accordion playing.