M-AUDIO OmniStudio USB - Manual (Page 36)

Next to each Stereo Aux Input is that Input’s Aux Mon/Rec switch. Pressing this switch and engaging it in the IN (Rec) position will route
the audio of that channel’s Stereo Aux Input to the OmniStudio USB’s A/D converter and directly to your audio software for recording.
It should also be noted that you will no longer hear the Aux Input signal going directly to the OmniStudio’s internal mixer. Once you
engage the Mon/Rec switch, you must either use the Direct Monitor circuitry or monitor through the audio software (see the section,
“Using ASIO or WDM Software Monitoring”) to hear your Aux Inputs.
It’s important to remember that each of the Stereo Aux Inputs are stereo inputs, carrying two audio channels each. Since the
OmniStudio USB is a four-bus device, you can route two Stereo Aux Input channels (four channels of audio) at a time.
It’s also important to note that:
Placing Stereo Aux Input 3 into Rec (IN) position overrides Stereo Aux Input 1 Rec switch.
Placing Stereo Aux Input 4 into Rec (IN) position overrides Stereo Aux Input 2 Rec switch.
Recording and Overdubbing Live Inputs
The OmniStudio USB is capable of sending up to four input signals to your computer and audio application. These inputs can come
from Mic/Inst Inputs 1 and 2, Line Inputs 3 and 4, or any combination of Stereo Auxiliary Input pairs.
Plug a male XLR connector into Mic/Inst inputs 1 and/or 2 if you wish to use them as Mic inputs. If your microphone requires phantom
power, press the front panel Phantom Power switch.
Plug a 1/4” connector into Mic/Inst inputs 1 and/or 2 if you wish to use them as Instrument level inputs. These inputs are designed for
electric guitars, acoustic instruments with pickups, or any high impedance signal requiring amplification.
Plug a 1/4” connector into Line Inputs 3 and/or 4. These inputs are designed for electronic instruments, tape decks, CD players and
other sources already at line level. Refer to Section 12, “Using the Mic/Inst and Line Inputs” for more details.
Different audio applications will vary, but the OmniStudio USB’s inputs will appear in your audio software as two stereo pairs, 1/2 and
3/4. You’ll want to select and enable a track for recording, and set up the gain structure for your recording levels. You’ll also want to
set up the way you monitor the signals you are recording.
Setting the Audio Track Playback Levels
Once you have recorded an audio track into your music software, you may want to adjust the playback levels for these audio tracks.
These playback levels will be controlled by your music software. The audio “returning” to the OmniStudio USB’s internal mixer from your
audio software is returning at “unity gain.” Unity gain means what goes in is what comes out—no gain is added and nothing is
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Aux In 1 is routed to Inputs 1/2, defeating the signal going to the
internal mixer.
Aux In 2 is routed to Inputs 3/4, defeating the signal going to the
internal mixer.
Aux In 3 is routed to Inputs 1/2, defeating the signal going to the
internal mixer.
Aux In 4 is routed to Inputs 3/4, defeating the signal going to the
internal mixer.
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