Line Inputs (Channels 3 - 8); Line Inputs (Channels 9 - 16); Digital Out Jack; Phones Jack - Alesis iMultiMix 16 USB Reference Manual

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A Tour of the iMultiMix16 USB
MIC/LINE | GUITAR button depressed, these inputs can
support high-impedance (1MΩ) active guitar or bass pickups using
balanced ¼" plugs.
3) LINE INPUTS (Channels 3 – 8)
These line inputs, marked LINE IN, are balanced 1/4" jacks that
offer the same 50dB of preamp gain and the high-pass filter
provided by the mic inputs (however, phantom power does not
apply to line inputs). These inputs accept line-level instruments
such as keyboards and drum machines. If you find that your
instrument has a weak line signal, just plug it into channels 1 – 8
and crank it up with the Gain knob. Note that the first two
channels are specially designed for handling guitar and bass signals
(see #2 above).
4) LINE INPUTS (Channels 9 – 16)
Unlike channels 1 – 8, the line inputs on channels 9 – 16 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 9 – 16 don't have the extra gain found on channels 1 – 8
because most line-level instruments don't require the extra boost.
Synthesizers 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.

5) DIGITAL OUT Jack

The digital output jack is used to send the 44.1 kHz stereo audio
signal to an Alesis Masterlink or any other recording device such as
a DAT recorder or a PC with an S/PDIF enabled sound card
installed.
Always use a high quality cable when connecting the DIGITAL
OUTPUT JACK to your recording device. We recommend that
you use a cable that is specifically designed to carry a digital signal
and does not exceed 5 meters (16.4 ft) in length.

6) PHONES Jack

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

7) 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.
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Any audio signal that is
routed to the MAIN
OUTPUTS will also be sent
out of the DIGITAL OUTPUT
jack. The level is controlled
by the MAIN FADERS. The
DIGITAL OUTPUT mirrors
the output from the MAIN
OUTPUTS.
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.