ALESIS MultiMix 12 FireWire - Manual (Page 21)

A Tour of the MultiMix FireWire 2
19
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.