Matrox MXO2 PCIe Host Adapter - Manual (Page 185)

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Defining your playback settings
3 Click the Hardware tab in the Audio Project Settings dialog box, and
then click the Hardware Setup button ( ).
4 Under Analog Audio Volume , drag the sliders to adjust the volume of your
analog audio output. By default, the sliders are locked so that they move
together. To move each slider independently, click the lock button (
) to
disable it.
5 Under SDI Audio Output Format , select the bit depth you want for your
embedded SDI audio output ( 20-bit or 24-bit ). This setting is not available
on MXO2 Mini.
6 Under HDMI Audio Output , select Output only two audio channels if
you want to output two audio channels from the MXO2 HDMI output,
instead of eight channels. This option is especially useful for HDMI
monitors that don’t accept more than two audio channels.
7 Select Use system sound card if you want to use your system’s sound card
to output audio played back from your sequence. Make sure this option is
cleared if you want audio to be output from your MXO2 system (this ensures
accurate A/V sync during playback).
8 Click OK to save your settings.