M-AUDIO RAD-050503 - Manual (Page 13)

3. The MIDI Output of the Radium is connected to the MIDI In of a sound
module. The audio output of the sound module can be plugged directly into
a sound system, or into a mixer, which is then connected to a sound system.
In the setup pictured below, the Radium is being used as a MIDI controller as
well as a MIDI interface, inputting MIDI data to the computer and its application
software, and outputting MIDI to a sound module from which sounds will be
produced. The Radium as a controller may also send MIDI information to an
existing internal soundcard’s MIDI synthesizer or any installed software
synthesizer, outputting the audio from the computer soundcard.
In this scenario, it may not be necessary to apply external power to the Radium.
With the power switch set to “USB Power,” the Radium receives power from
the USB port on your computer. It is recommended that you plug directly into
the USB port on the computer. You may also choose to use power from
batteries (Radium49 only) or an external power supply.
Additionally, the Radium may be used as a “standalone” keyboard controller,
independent of the computer and its USB port. In this case, the Radium must
receive power from a power supply, by switching the power setting on from the
rear panel. Also, you will want to use the MIDI out port that is labeled
“Keyboard.” A setup such as this may be used in a performance situation, or
when you wish to use the keyboard without the computer.
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