Asus PCI Express Audio Card Xonar DX User Manual page 66

6. Check if the levels shown in the Adjusting level window are OK (the level
meter will be green).
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7. If the recording volume level is not high enough, please check and make
the WAVE and Master Volume have been at the maximum level; Instead, if
the recording volume level is too high, please lower the WAVE and Master
volumes gradually until the level is ok.
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ASUS Xonar DX