20 chapter 1: product introduction, The game/midi module is purchased separately, P4bp-mx game connector game1 – Asus P4BP-MX User Manual
Page 30: P4bp-mx digital audio connector spdif

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Chapter 1: Product introduction
10. Digital Audio connector (6-1 pin SPDIF)
This connector is for the S/PDIF audio module to allow digital sound output.
Connect one end of the S/PDIF audio cable to this connector and the other
end to the S/PDIF module.
9. GAME/MIDI connector (16-1 pin GAME1)
This connector supports a GAME/MIDI module. If a GAME/MIDI module is
available, connect the GAME/MIDI cable to this connector. The GAME/MIDI
port on the module connects a joystick or a game pad for playing games, and
MIDI devices for playing or editing audio files.
The GAME/MIDI module is purchased separately.
P4BP-MX
P4BP-MX Game Connector
GAME1
+5V
+5V
J2B1
J2CX
MIDI_OUT
J2CY
J2B2
MIDI_IN
J1B1
J1CX
GND
GND
J1CY
J1B2
+5V
P4BP-MX
P4BP-MX Digital Audio Connector
SPDIF
GND
+5V
SPDIF_IN
SPDIF_OUT
GND
1