I have a new QN55Q70 (55 inch) and was struggling with this. No delay through TV speakers, but significant delay through soundbar despite setting "expert delay" to 0. This was true whether I used optical or hdmi-arc. After reading a note somewhere in this string about someone using bypass audio, I went into "expert" again to check it out. This is only available on my model if I have an HDMI source and use HDMI-ARC to connect to soundbar/receiver. For the moment seems to be working reasonably well for cable content although sometimes hard to tell given how much live content is from secondary zoom type sources in time of COVID. Will update in a couple of days.
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