5
10. Modulation Wheel: This wheel is used to add expression to performances by changing the intensity of certain
effects. By default, most synthesizers assign this wheel to control vibrato (change in intonation) or tremolo
(change in volume) although it is usually possible to reassign the function of this wheel through the instrument’s
control panel. Rolling the Modulation Wheel upward will increase the modulation effect, while rolling downward
will reduce the effect. The Modulation Wheel is an assignable controller capable of sending a variety of MIDI
messages other than Modulation data.
11. Control Button (C10): This mapable button can be assigned to send Note, CC, and other MIDI messages.
For DirectLink operation, please see the DirectLink User Guide available at m-audio.com/directlink.
Rear Panel
1. USB Port: The USB 2.0 port (backward-compatible with USB 1.1) delivers
power to the keyboard and transmits MIDI data when connected to a
computer.
2. Sustain Pedal Input: This input accepts a momentary-contact foot pedal
(not included). When pressed, this pedal will sustain the sound you are
playing without having to keep your fingers pressing down on the keys. The sustain pedal input can be assigned
to send Note, CC, and other MIDI messages.
NOTE: The polarity of the sustain pedal is determined by the keyboard upon startup. When an Oxygen 25
keyboard is powering up, the sustain pedal is assumed to be in the "up" (Off) position. It is important that the
sustain pedal is not pressed during startup, otherwise the pedal will reverse its operation, and notes will sustain
when the pedal is not pressed.
3. On/Off Switch: Use this switch to power the device on or off. When this switch is set to the “on” position,
Oxygen 25 is powered through the USB connection to your computer.
4. Kensington Lock Connector: This connector is compatible with standard laptop-style Kensington security
cables for theft protection.
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