The drum brake is adjusted to have a slight friction sound in order to achieve better performance. This friction sound can increase the friction between the drum brake and the drum surface, resulting in a more obvious sound effect when hitting. The specific reasons are as follows:

1. Increase the layering of the timbre: The slight friction sound of the drum brake can make the drum sound richer and more diverse, and increase the layering of the timbre. This frictional sound produces tiny frictional vibrations with each hit, making the sound more vivid and full.

2. Enhance the sound effect: The friction sound can make the contact between the drum brake and the drum surface closer, increasing the energy transfer of the strike, thereby producing a stronger sound effect. This gives the player greater control over the volume and timbre of the drum, making the performance more expressive.

3. Improve playing skills: Adjusting the friction sound of the drum brake requires the player to have certain skills and experience. By adjusting the contact method and strength between the drum brake and the drum surface, the player can achieve the ideal friction sound effect. Therefore, adjusting the drum brake with a slight friction sound can not only improve the sound effect, but also encourage the player to improve their performance skills and expression.

Extended content: In addition to adjusting the friction sound of the drum brake, drummers can also use other techniques to enrich the timbre of the drum during performance. For example, by adjusting the strength, position, and angle of the hit, different sound effects can be produced. At the same time, drummers can also use different playing techniques such as rolling, percussion, and percussion to perform various musical styles and express emotions. Therefore, the drummer's skill and experience play a key role in achieving the desired sound.