Asus Crosshair V Formula ThunderBolt User Manual page 54

8.. Front.panel.audio.connector.(10-1.pin.AAFP)
This connector is for a chassis-mounted front panel audio I/O module that
supports either HD Audio or legacy AC`97 audio standard. Connect one end
of the front panel audio I/O module cable to this connector.
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We recommend that you connect a high-definition front panel audio
module to this connector to avail of the motherboard's high-definition audio
capability.
If you want to connect a high-definition front panel audio module to this If you want to connect a high-definition front panel audio module to this
connector, set the Front.Panel.Type item in the BIOS setup to [HD.Audio];.
if you want to connect an AC'97 front panel audio module to this connector,
set the item to [AC97]. By default, this connector is set to [HD.Audio].
Chapter 2: Hardware information