Introduction
Congratulations on your purchase of M-Audio’s O2. The O2 follows in the footsteps of the mobile USB MIDI controller that started it all—the
Oxygen8. Small enough to fit in a bag along with your laptop, the slim¬line M-Audio O2 is perfect for throwing down bass lines, programming
drum patterns, triggering effects and tweaking virtual studio parameters—anywhere, anytime.
This guide provides a basic overview of how to use the O2. Please refer to the complete manual, found on the Documentation CD, for more
comprehensive instructions and information about advanced functionality.
What’s in the Package?
Your M-Audio O2 package should contain the following items:
• O2 keyboard • Software Bundle CD
• Documentation CD • USB Cable
Power and Connection Via USB
You can power the keyboard via USB or an optional external power supply. Use only one method at a time.
1. Check that the on/off button on the back of the unit is set to “Off.”
2. Plug in the USB cable provided with the M-Audio O2 to a free USB port on your computer.
3. Plug in the other end of the USB cable to the USB input on the M-Audio Oz.
The single USB cable not only powers the M-Audio O2 but also sends MIDI data to and from your computer system.
You can also use a power adapter (not included) with the following specification: 9V DC output, 250¬300mA, center positive.
Verify that you are not powering the M-Audio O2 keyboard via USB, then simply plug in the power supply to the input labeled DC 9V and switch
the power on.
Note: Do not leave the adapter plugged in for long periods of time if the unit is not in use.
Windows XP and Mac OS X
If you are using Windows XP or Mac OS X, you may simply switch the power position to “on.” Because the M-Audio O2 keyboard is class compliant,
it will work with out any further installation.
M-Audio O2 Features and Functions
If the installation process has been completed successfully, please read through the following pages for a better understanding of the O2 and
how it works.

Program Mode

This manual refers to “Program Mode.” Program Mode defines the state of the M-Audio O2 when the ADVANCED FUNCTION button is pressed.
In Program Mode, the keyboard of the M-Audio O2 is set up for selecting functions.
The functions are listed 2 above each key on the O2 keyboard. The second octave of the O2 keyboard is for numerical data entry while in Program
Mode.
The Preset “+” and “-” buttons can be used for increment or decrement changes in assigned value when in Program Mode.
When entering numerical values in Program Mode, the LED shows the value entered. This value will update as you enter numerical data.
If the M-Audio O2 is in Program Mode, a small dot will appear in the bottom right hand corner of the LED display.
Note that pressing the GLOBAL CHAN button will also engage Program Mode, since the numerical data entr y keys are required to enter the
new channel assignment. Also, the preset “+” and “-” buttons can be used.
Exit Program Mode by pressing the ADVANCED FUNCTION button when you are finished with programming. The ENTER key must be pressed each
time the numerical data entry keys are used to enter a value. Once the ENTER key has been pressed, Program Mode will exit.

Testing the M-Audio O2 with Your Software

We recommend that you verify that your software application is properly communicating with the M-Audio O2 keyboard. Most software applications
have a MIDI IN indicator. To confirm data is being received, press any key on the keyboard. If you encounter any issues or the software receives no
data, please verify you selected the keyboard’s USB driver as the MIDI Input for your software. In addition, please read the troubleshooting section
at the back of this manual and please consult the manual that came with your software for proper configuration within the software application.

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