GROUPS OR BUSSES
In this diagram we have added some further controls. There is now a central section called the "group section." (Groups are also sometimes referred to as "busses.")
You will also notice that to the right of each blue channel fader there are now buttons. These are called routing buttons & allow you to route, or direct the channels to different destinations.
The destinations you can route channels to are group 1, group 2, group 3, group 4 & the left & right outputs.
Here is an example. If you press the button marked 1 - 2 on channel 1 & channel 1 is panned centrally, that channel will be routed to groups 1 & 2 equally. The yellow faders will control the level being output from group outputs 1 & 2.
If you pan channel 1 all the way to the left & press the button marked 1 - 2, channel 1 will only be sent to group 1 output.
But if you pan channel 1 all the way to the right & press the button marked 1 - 2, channel 1 will only be sent to group 2 output.
It is important to realise now that the signal travelling down the channel strip will stop at the bottom of the channel & will nowhere until you physically route it to a destination by pressing the required routing buttons.