Asus P4S533-VM - Manual (Page 38)

26 Chapter 2: Hardware information
P4S533-VM
®
P4S533-VM Internal Line Out Connectors
FP_LO_SWL
FP_LO_SWR
BLOL FLOL
BLOR FLOR
3. Line out selector (FP_LO_SWR, FP_LO_SWL)
(on audio models only)
By default, these jumpers are shorted (jumper caps on) to route the
signal from the audio controller to the rear panel Line Out jack to make
it available for audio out devices like speakers or headphones.
If you connect the Intel Front Panel audio cable to the FP_Audio
connector (see page 38 for the location), remove the caps from these
jumpers to allow automatic switching of audio signals between the rear
panel Line Out jack and the audio cable.