Звук можно отключить перемычкой.
Материнская плата поддерживает цифровой вывод звука
"J8 - Digital Audio Connector
Connect this connector to the Digital Audio ribbon cable/
bracket that contains 3 jacks for Aux IN, SPDIF IN and
SPDIF OUT device. Aux IN is used as the second Line-in
port. SPDIF IN is used to input the external digital audio.
Connect SPDIF OUT to the AC3 Audio Amplifier or Mini-
Disk to play, and set the following jumper to select 5V or
0.5V signal level for used device."