2Tk Switch; Aux Ret A Level; Effects / Aux Ret B Level; Led Meters - Alesis iMultiMix 16 USB Reference Manual

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A Tour of the IMultiMix16 USB
9)

/ 2TK Switch

When you engage this switch, the signals coming in from the USB
connection and the 2-TRACK IN inputs are blended and routed
to the headphones and to the control room output. This level is
controlled by the HDPH / CTRL ROOM level control and
cancels out any signal from the main mix.

10) AUX RET A LEVEL

This is the level control for the signal returning to the mixer via
AUX RETURN A.

11) EFFECTS / AUX RET B LEVEL

If you are using one of the iMultiMix's internal effects, this knob
controls the effect level. If AUX SEND B is connected to an
external device, this knob controls the level for AUX RETURN B.

12) 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.

13) POWER Indicator

When this LED is lit up, that means the POWER ON switch on
the rear of the mixer has been activated.
14) +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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