(HD I/O or 192 I/O Only)If you are using an Avid HDX, HD Native, or Pro Tools|HD system with an HD I/O or 192 I/O, use the Calibration Reference Level option (in the Operation Preferences page) to set the reference level when Pro Tools is in Calibration mode.
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For instructions on calibrating an HD I/O, see the HD I/O Guide.
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For instructions on calibrating a 192 I/O, see the 192 I/O Guide.