User guide

Chapter 2: Mbox Pro Hardware Overview 7
Spkr (Speaker) Button
You can assign Monitor outputs pairs to the
Speaker button and cycle through the pairs as con-
figured in the Control Panel (see Chapter 5, “Using
the Driver Control Panel” and “Control Room As-
signment” on page 31). This is useful for A/B-ing
your mix between different studio monitors.
When pressed and held, it sources Aux inputs 5–6,
letting you can switch between monitoring play-
back from your audio application and monitoring
an external source (such a CD player) connected to
Aux inputs 5–6.
Headphone Outputs
Use the A and B, front panel Headphone outputs to
connect stereo headphones with a 1/4-inch stereo
connector. Headphone output A mirrors Monitor
outputs 1–2 by default. Sources for the Headphone
outputs can be configured in the Control Panel. See
“Stereo Mix Section” on page 32.
Headphone A and B Volume
Knobs
The Headphone knobs adjust the output level of
their corresponding Headphone output (A or B).
Multi Button
The Multi button can be assigned to execute sev-
eral functions in Pro Tools, including
Track Create, Start/stop Record, Tap Tempo, Tog-
gle Marker Locations, and Save Session. For de-
tailed information, see Chapter 6, “Using the Multi
Button.”
Power Indicator LED
The Power LED indicates that the Mbox Pro is re-
ceiving power from its power supply. Once the
light is on, audio can pass in or out of the system. If
the light is flashing, the power is not correct or
clock is not locked.