Grouping is to group several similar input signals together, and then send each group of channels to the main output. 

When you input a lot of signals, if you want to adjust each channel during the performance, this is a very big job, and it is impossible to do it at the same time(Unless you are Squidward Tentacles). But if you can group them into a bus, you can adjust the volume directly by one bus faders. The bus can usually be controlled like a single input channel, allowing engineers to control the entire signal group at once.

The grouping of output channels can be used to make up sound boxes or external recording, or return speakers, as well as branch venue signal output, etc., very flexible.

In a large-scale performance party, you use a 32-channel mixer with 6 groups, the instrument microphone has 16 inputs; the vocal microphone has 8 inputs; other lavalier microphones and headset microphones have 8 inputs ；

In a live performance, if you want to adjust the output of the instrument microphone, it is very difficult to adjust the individual channels. At this time, it can be solved by the grouping function. You can divide the 16-channel instrument microphone input signal into 1-2 buses, and then you can control the instrument microphone part through 1-2 bus faders, saving at least 80% of the workload. The vocal microphone signal can also be based on demand1 -2 buses, the lavalier microphone and the headset microphone are the same.

In this way, engineers can easily control the signal output of the entire performance.