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Hello Sonos lovers. I am planning to buy a mixer to play karaoke in my garage tv. My setup right know is a Samsung TV connected to a Sonos amp through HDMI arc. TV sound is coming through a pair of in ceiling speakers, using tv apps and a Chromecast. 

Can I connect a mixer using the tv optical out - mixer optical in - mixer analog out - Sonos amp line in?

If so, will the arc and line in work simultaneously?

Thanks 

No, the two inputs cannot be used at once, it's either/or.  Also, the line in is buffered, causing a 75ms delay, which means it is not very useful for live performance.