User guide

Chapter 4: Making Studio Connections 19
4 On the front of the Mbox Pro, carefully turn the
Gain control knob to the right to increase the in-
put level of your guitar.
Connecting Keyboards and
Mixers
To use a keyboard or mixer with Mbox Pro:
1 Plug your keyboard (with line outputs), mixer,
or other audio source into any one of the four
Line Input channels on the back of the
Mbox Pro. If your source is stereo (such as a
stereo keyboard or the stereo output from a
mixer), connect the left channel (often the white
plug) to Input 1, and right channel (often the red
plug) to Input 2.
2 On the front of the Mbox Pro, set the Front/Rear
switch to Rear or Mic/Line switch to Line (that
corresponds to your channel).
3 On the front of the Mbox Pro, turn the master
volume knob to the desired level.
4 Set your instrument’s volume to its optimal
level. For example, the optimal level for most
keyboards is between 80% and 100% of maxi-
mum volume.
5 On the rear panel of the Mbox Pro, use the Input
Level switch for +4/–10 input line level settings
(one for each stereo pair, 1/2 & 3/4). In the “out”
position the level is set to +4; and when pushed
to the “in” position, it is set to (–10).
To use Aux Input 5/6 Line inputs:
 Plug your keyboard, mixer or other line level
device into the Aux Input 5/6 inputs (L and R).
Connecting DJ Equipment
To use the Aux Inputs 5/6:
 Plug your DJ mixer, DVD player, or similar out-
puts into the Aux Input 5/6 inputs (L and R).
Connecting Inserts
Mbox Pro provides a total of four insert jacks (In-
serts 1–4) for inserting external processing devices
such as an EQ or a compressor between the input
channel’s onboard mic preamp and the onboard
analog to digital convertor.
To insert an external processor on an input:
1 Using a 1/4-inch insert cable (single TRS con-
nector to dual TS connectors), connect the sin-
gle TRS connector (the connector with two
rings) to one of the insert jacks on your
Mbox Pro.
You can tune your guitar using the on-board
tuner from the front panel of the Mbox Pro.
Hold down the Mono and Dim buttons to
launch the tuner in the Driver Control Panel.
See “Setup” on page 26.
If your keyboard has unbalanced outputs, set
the line input switch to -10 instead of +4. Re-
fer to your keyboard’s documentation.
There is no RIAA preamp or grounding post
on the Mbox Pro, so connect a turntable to a
mixer or phono preamp before connecting to
Mbox Pro.
For Aux inputs 5/6, the 1/8-inch jack takes
precedence over the RCA jacks.
Insert jacks for external processing on Mbox Pro
Inserts 1–4