Generally speaking, there are 4 and 8 channels in a few channels, while there are 96 or more channels in the most channels. The control of each channel is divided into two parts: main control and auxiliary control. The auxiliary signal has an independent output port, which can output two or more groups of mixed signals at the same mixer.
The following is an anatomy of a channel of the mixer (see Figure 1 and Figure 2 below):
Figure 2 is a part of the tuning table in Figure 1. In the yellow circle, the signal input is from the black female XLR or 6.35 interfaces on the top (usually the input port of microphone); the breakpoint input interface (Note: insert socket on the tuning table, the indication in Figure 2 is breakpoint input, which is generally used to insert peripheral processing equipment, such as effector, noise gate, pressure limiter, etc.)
Input gain control gain knob (shown in Figure 2 as dark red knob, which is generally used to enhance microphone pickup sensitivity); 4-stage equalizing adjustment (shown in Figure 2 as 4-stage equalizing white knob, which is mainly used to adjust the high, middle, low and low frequency band knobs); Auxiliary output knob (Note: in Figure 2, the blue knob is connected with the external power amplifier stage monitor speaker, and the Yellow knob is used to adjust the internal effector of the console).
Sound image pan knob (Figure 2 indicates left and right sound white knob, which controls left and right speakers to make sound, and can control single side speakers to make sound); volume control push (white push rod in Figure 2, audio signal is finally output from delay to LR output port of the mixing console).