M-Audio MobilePre USB User Manual page 21

Mac OS X: Follow the driver software installation for Mac OS X and
restart. Launch the MobilePre USB Control Panel, which is found in the
bottom row of the OS X System Preferences panel.
or
The control panel has the following sets of controls:
USB Record
The USB Record section controls the level of the signal from the
microphone and instrument inputs to the recording software.
Volume: There is a volume fader for both input channels 1 and 2. In most
cases you should leave these controls turned all the way up.
Mute: This box, when checked, stops any input signal from reaching the
recording software.
Link: This button links channels 1 and 2, so that any changes made to one
will change the other.
Direct Monitor
This section controls the level of the hardware direct monitor. The
MobilePre USB provides an analog monitor path from the inputs to the
outputs.When signal is recorded into software, there is often a slight delay
before it reaches the outputs. This delay, called latency, is caused by the
processing required to convert and record audio.Any delay can distract the
artist being recorded, so the MobilePre USB provides this "Direct
Monitor" for use during recording.
Volume: These faders control the level of the direct monitor path. Set
the controls to find the right balance while recording.
Mute: This box, when checked, stops the direct monitor signal from
reaching the recording software.
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