M-AUDIO Air 192|4 Vocal Studio Pro Desktop 2x2 USB Type-C Audio Interface with Mic and Headphones - Manual (Page 7)

7
Features
Top Panel
1.
Input Gain: Adjusts the input's gain
level. Set this knob so the
corresponding
LED Meter (located
below the knob) displays a "healthy" (-3
dB, yellow LED) level during
performance—but not so high that the
meter "clips" or peaks (Clip, red LED),
causing distortion in the audio.
2. LED Meters: Indicates the input signal
level from the Combo Input or
Instrument Input .
3. USB / Direct Blend: Adjusts the mix of
the audio signal from your inputs
(
Direct ) and the audio output of your
computer ( USB ) that will be sent to the
Main Outputs and Headphone Output .
This knob is useful for dealing with “latency” when you are recording in your DAW. Latency
is a delay in sound that may occur between the incoming sound (playing your instrument,
singing, etc.) and outgoing sound (when you hear it in the DAW).
Latency is often the result of the “buffer size” setting, which is usually located in your
DAW’s Preferences, Options, or Device Setup menu. Higher buffer sizes generally result in
higher latency. In some cases, lower buffer size settings can consume a lot of your
computer’s CPU and cause audio glitches. To prevent these audio glitches, you will need
to use a higher buffer setting, and this may result in latency.
If you are experiencing latency when recording, adjust the knob towards the Direct
position to increase the blend of unprocessed audio from your inputs directly to your Main
Outputs and Headphone Output . This will let you hear the incoming audio from your
inputs without latency while still being able to hear the audio from your DAW. When
listening to the playback, adjust the knob all the way to the
USB position.
If your computer is powerful enough, you may be able to set the buffer size setting in your
DAW low enough such that you may never need to listen to the direct audio signal from
your inputs. In this case, set the
USB / Direct Blend knob all the way to the USB position
to monitor only the audio output of your DAW.
4. Headphone Level: Adjusts the output volume of the Headphone Output .
5. Monitor Level: Adjusts the output volume of Main Outputs , which should be connected
to your powered monitors or amplifier system.
6. Power LED: Lights up when a valid USB connection has been established between your
computer and AIR 192|4. Use this light to verify that AIR 192|4 is receiving power and is
ready to use.
7. +48V (Phantom Power) LED: Lights up when phantom power is engaged.
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