Matrox MXO2 PCIe Host Adapter - Manual (Page 326)

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Appendix B, Matrox MXO2 Connectors
Composite video (Y) Allows you to output SD video to an
analog NTSC or PAL device. Connect a composite video cable
to a video monitor, VTR, or other NTSC or PAL device.
Analog audio (unbalanced) Provide outputs for unbalanced
analog audio channels one and two, or one stereo pair. Connect
RCA cables to a VTR, audio mixer, speakers, or other audio
device.