Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 15)

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Once the Scarlett 18i8 is set as the preferred Audio Device* in your DAW, all 18 inputs and eight
outputs will appear in your DAW’s Audio I/O preferences (note however that Ableton Live Lite is
limited to a maximum of four simultaneous mono input channels and four simultaneous mono
output channels). Depending on your DAW, you may need to enable certain inputs or outputs before
use. The two examples below show two inputs and two outputs enabled in Ableton Live Lite’s
Input Config and Output Config pages.
* Typical name. Terminology may differ slightly between DAWs.
Loopback Inputs
You will notice that two additional inputs - “Inputs 11 & 12” – will be listed on the Input Config page
of your DAW’s I/O Preferences. These are virtual “loopback” inputs within software, not additional
physical inputs. They can be used to record DAW tracks from sources within your computer,
e.g., from a web browser. Focusrite Control incudes a Loopback 1-2 mix tab, where you can choose
which inputs to record.
Full details of how to use the loopback inputs can be found in the Focusrite Control User Guide.