In 18keys clarinet, when playing tremolo, the fingers should be even and slack, not twitching, let alone shaking the arms together.

The 18keys clarinet manufacturer tells you that if you play tremolo with your right finger, you can let the left hand hold the instrument to free the right hand, and the back of the right hand is slightly forward; when the left hand is playing tremolo, the left palm is slightly tilted upward, so that the left and right hands can be easily and freely. Play all tremolo. Undoubtedly, 18keys clarinet manufacturers tell you that choosing a good fingering can reduce the burden on the player's fingers, and it is also an important link to ensure intonation, free pronunciation, and pure timbre.
It is worth mentioning that the choice of fingering will be different in different tones, and the choice of fingering also represents the level of a player. The 18keys clarinet manufacturer tells you that when playing fast tonality, the coordination of the fingers is often prone to time differences, which requires more attention to the feeling of the fingers pressing down - the palm is inward, and the fingers are closer to the hole key.
The 18keys clarinet manufacturer tells you that when playing a fast passage, the breath and fingers need to cooperate with each other. You should fill each tone with the breath, and pay attention to whether each tone in the passage is clear. 18keys clarinet manufacturers tell you to remember: the lower the finger, the smaller the space, the faster the speed will be.