Matrox MXO2 PCIe Host Adapter - Manual (Page 101)

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Defining your capture settings
Monitoring audio levels for capture
If you select Show VU meters on the Audio Capture Settings page, each
time you configure your Matrox MXO2 capture settings or open the Capture
panel to start a capture in Adobe Premiere Pro, VU meters will be displayed to let
you monitor the levels of your currently selected audio input source.
As you play your audio source, the color of the input level is green at or below
–12 dBFS, yellow between –12 and –6 dBFS, and red above –6 dBFS. The
clipping detectors will “light up” (become red) whenever audio clipping occurs.
The peak level indicators are thin lines that show the highest level recently
reached. These indicators will show the peak level for about two seconds or until
a higher peak level is reached.
If needed, adjust the audio level on your source device to keep the average input
level between –30 and –10 dBSF.
Clipping detectors
Peak level indicators