Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 11)

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7. PAD – four green LEDs; illuminate when PAD is selected from Focusrite Control for Inputs 1
to 4. PAD decreases the signal level going to your DAW by 10 dB; use when the input source
has a particularly high level.
8.
USB LED - a green LED which illuminates when the unit is recognised by the computer
to which it is connected.
9. ALT – when Speaker Switching is activated via Focusrite Control, the main monitor mix is
diverted from LINE OUTPUTS 1 and 2 to LINE OUTPUTS 3 and 4. Connect a pair of secondary
monitor speakers to the LINE OUTPUTS 3 and 4, and select ALT to switch between your main
monitors and the secondary pair. ‘ALT’ illuminates green when selected. This function may
also be selected from Focusrite Control.
10. MIDI LED – a green LED illuminates when MIDI data is received at the MIDI IN port.
11. MONITOR – main monitor output level control – normally adjusts the level at Outputs 1 and 2
on the rear panel, but will follow selection of ALT mode [9], and will also control the level of
any other outputs assigned to Hardware Control in Focusrite Control.
12. - connect one or two pairs of stereo headphones at the two ¼” (6.25 mm) TRS jack sockets
below the headphone volume controls 1 and 2. The headphone outputs always carry the
signals that are currently routed to analogue outputs 5 & 6 and 7 & 8 respectively (as stereo
pairs) in Focusrite Control.