master level control meaning in English

主电平控制

At the output of the active gain circuits is the master level control
在有源增益电路的输出端是主音量控制。
Set the right and left level controls at minimum gain ( counterclockwise ) and adjust the master level control to as high as you will want to listen
把左右电平输入设定于最少增益位置（逆时针方向），调整主音量控制至你所想要的最高水平。
The gain stage operates at a constant level regardless of the setting of the master level control , and so the sound of this circuit will not alter at various level settings
无论主音量控制的位置如何，放大级都可以工作于一个稳定的电平，并且不同的音量设定不会引致该电路的音色变化。