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TOP PANEL FEATURES
1.
MIC INPUT – Connect a
microphone to this input with
an XLR cable.
2.
GUITAR / LINE INPUT –
Connect a line-level device or
guitar to this input with a 1/4"
cable.
3.
INSERT – The insert jack
allows
you
to
compressor, EQ, or any other
signal processor in between
the iO4's preamplifier and A/D
converter.
4.
GAIN – Adjusts the channel
audio gain level.
5.
MIC/LINE/GUITAR SWITCH –
When this switch is in the
"GUITAR" position, the
channel will serve as a high-
impedance input for
connecting guitar or bass
instruments. When the switch is in the "MIC/LINE"
position, the channel will accept mic or line-level
signals.
6.
USB LED – Lights up when a USB connection has
been established with your computer.
7.
MIDI IN LED – Flashes whenever MIDI data is
received from an external MIDI device.
8.
MIDI OUT LED – Flashes whenever MIDI data is
sent out of the iO4.
9.
POWER LED – Lights up when unit is powered on.
10.
MONO / STEREO – Adjusts the headphone mix and main mix for mono or stereo operation.
11.
MONITOR MIX – Blend in any amount of zero-latency signal from your inputs with the output of your
computer.
12.
PHANTOM POWER SWITCH – Individual toggle switches activate and deactivate phantom power for
channels 1+2 and channels 3+4. When activated, phantom power supplies +48V to the XLR mic inputs.
Please note that most dynamic microphones do not require phantom power, while most condenser
microphones do. Consult your microphone's documentation to find out whether it needs phantom
power.
13.
PHANTOM POWER LED – Lights up when phantom power is engaged.
14.
MAIN VOLUME – Adjusts the signal volume going to the MAIN OUTPUTS.
15.
CHANNEL 1/2 VOLUME METER – Displays the signal level for input channels 1 and 2.
16.
CHANNEL 3/4 VOLUME METER – Displays the signal level for input channels 3 and 4.
17.
HEADPHONE VOLUME – Adjusts the volume level of the headphone output.
18.
HEADPHONE MONITOR MIX – Adjust this switch to monitor the USB OUTPUT (channels 1 and 2),
USB OUTPUT (channels 3 and 4), or the direct mix of 4 input channels: channels 1 and 3 in the left
headphone output and channels 2 and 4 in the right headphone output and the USB output.
26
25
1
insert
a
2
5
10
24
23
22
21
1
2
3
3
15
4
4
8
5
13
11
12
NOTE: Turning on phantom power will
cause a momentary jump in the LED
meters and a dropout in audio.
NOTE: Do not use the MIC INPUT and
GUITAR/LINE INPUT at the same time on
one channel.
channel and cause distortion.
4
20
1
3
2
2
16
6
4
7
5
9
13
17
14
18
12
This may overload the
19
1
3
4
5
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