Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 21)

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Using the Scarlett 18i8 as a stand-alone mixer
The Scarlett 18i8 has the ability to store a mix configuration defined in Focusrite Control within the
hardware. This feature lets you configure it – for example, as an on-stage keyboard mixer – using your
computer, and then upload the configuration to the device itself. Then you can use the Scarlett 18i8
as a simple local mixer as part of your keyboard rig to control the overall mix of multiple keyboards.
To FOH Mixer
In the example illustrated, three stereo keyboards are connected to the inputs of the Scarlett
18i8; the Monitor Outputs go to the main PA system. The performer can adjust the gain for two
of the keyboards against the third from the front panel; he/she can also adjust the overall level
of the keyboard mix.