Led Meters; Power Indicator; +48V Indicator - Alesis MULTIMIX 16 Reference Manual

A Tour of the MultiMix USB2.0
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LED Meters

These are the two rows of yellow, green and red lights you see in
the master section of the mixer. They are very versatile, allowing
you to view the signal level of the main mix, individual channels
(both pre- and post-fader) and aux returns depending on which
signal you have routed to the control room mix.

POWER Indicator

When this LED is lit up, that means the POWER ON switch on
the rear of the mixer has been activated.

+48V Indicator

When this one is lit up, that means the PHANTOM ON switch on
the rear of the mixer has been activated and is supplying +48V
phantom power to all XLR mic inputs.
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