Chapter 2: Mbox Hardware Overview 7
Checking Phase Relationships
The Mono switch can also be used for a quick
check of the phase relationship between
Source 1 and Source 2 inputs.
Guitar Tuner Function
When the Dim Button and the Mono Button are
pushed at the same time, the Guitar Tuner func-
tion is activated. The Dim and Mono LEDs flash
between off and on to indicate tuner mode is ac-
tive. When a string is played on a guitar plugged
into an Instrument Input, the Input 1 Sig-
nal/Clip LED is illuminated red if tuning is too
low, off when tuning is too high, and green
when tuning is correct. The Input 2 Signal/Clip
LED is illuminated red if tuning is too high, off
when tuning is too low, and green when tuning
is correct. The Tuner interface is displayed in the
Software Control panel if the Software Control
Panel is open.
Front Panel Headphone Output
Use the Headphone Output to connect stereo
headphones with a 1/4-inch stereo connector.
The headphone outputs mirror the signal sent
to the Monitor Outputs.
Headphone Volume
The Headphone Volume knob adjusts the out-
put level of the Headphone port. This output is
independent of the Monitor Level knob.
Multi Button
(Pro Tools Only)
The Multi Button can be assigned to execute sev-
eral functions in Pro Tools, including Add Track,
Start/Stop Record, Tap Tempo, Toggle Marker
Locations, and Save Session. See Chapter 5, “Us-
ing the Multi Button (Pro Tools Only).”
USB LED
The USB LED indicates that the Mbox is receiv-
ing power from its USB connection. Once the
USB light is on, audio can pass in or out of the
system.
The USB LED is a power LED, which is also indi-
cates when the unit is powered in stand-alone
mode. In this mode you can connect a USB cable
but that cable is connected to a wall outlet in-
stead of a computer (similar to an iPod or
iPhone).
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