All the sounds are already realized.
When you look at the experiences of a person who wakes up, they often wake up from sound.
It is a temporary disappearance of thoughts caused by supernatural forces inside in an unexpected situation where you can't move forward or go back in a situation that you can't understand anymore, not understanding.
Those who listen to the dharma only by understanding the dharma result in mass production of problems other than problem solving through understanding.
Also, when you fall into those new problems, you deviate from the nature of the problem.
At that time, the Zen master's shout is a lion roar that destroys all delusions at once and returns us to where we are today.