I wonder, what these SPDIF on the 01X is doing. Whats coming out of the SPDIF OUT connector?

Because I am experimenting with a Yamaha Sound projector Beamer, creating Dolby 5.1 sound, which device has an SPDIF INPUT optical and coax. What I am trying to do is to get the sound whats normally going out from the Stereo L/R out or the MONITOR L/R out, coming out from the SPDIF out to the Yamaha Sound projector device. Yes, I know the stereo out and the monitor out are analoge outputs, but inside the 01X must the digital information be present of the song played by my MOTIFES8.

I suppose I have to reroute these ES8 data to the SPDIF output. How do I manage that, please in simple words.

Thanks in advance

Jan