Line Inputs (Channels 5 - 8); Phone Jack; Aux Returns; Aux Sends - Alesis MultiMix8FireWire Reference Manual

A Tour of the MultiMix FireWire
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Line Inputs (Channels 5 – 8)
Unlike channels 1 – 4, the line inputs on channels 5 – 8 are stereo
inputs that have left and right inputs. If you're using one of these
channels as a mono input, plug your instrument into the left input.
Channels 5 – 8 don't have the extra gain found on channels 1 – 4
because most line-level instruments don't require the extra boost.
MIDI and other electronic instruments will work especially well on
these channels. These inputs are also good for connecting CD
players or tape decks, as these audio sources don't require extra
gain.

PHONE Jack

The headphone jack accepts 1/4" plugs. If your headphones are
1/8", you can find a 1/8" to 1/4" adapter in most electronics
stores.

AUX RETURNS

These are the 1/4" jacks where you connect the outputs of an
external effects processor or other audio source. Each aux return
gives you 15dB of gain that can be controlled by the AUX RET A
and EFFECTS / AUX RET B LEVEL knobs in the mixer's
output section.

AUX SENDS

Use these jacks to connect the lines going out of the MultiMix into
the input of an external effects processor. The aux sends give you
10dB of gain that can be controlled in the AUX section of each
channel input.

2-TRACK

The 2-TRACK IN and OUT jacks are standard RCA jacks. You'll
use the OUTs for mixing to a tape deck or other recorder. With
the INs you can bring in a signal, which can be monitored and
even added to the main mix via the 2TK TO MIX switch in the
master section of the mixer.
The 2-TRACK INPUT is blended with any signal coming back
from a computer over the Firewire connection.

MAIN MIX OUT

These 1/4" jacks are where the signal on the main mix bus leaves
the mixer. From there you can send it to a recorder or a PA system.
The level of this signal is controlled by the MAIN MIX level
control.

CTRL RM OUT

You can use these 1/4" jacks to send the control room signal to
the input of the amplifier driving your monitors or headphones.
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If you are using an effects
device with only a mono
output, plug it into the left
return of STEREO AUX
RETURN. It will appear in
the center of the stereo
spectrum, and not to the left.