Hello seaice! The HDMI I2S signalling is not compatible with AGD inputs. It is like the Gustard U12 where resulting absolute audio phase is 180 deg. plus L- R channels are swapped.
Hi DACLadder, thanks again, very good info! My MScaler>HE7S mission is probably doomed. I doubt that a device converting 352.8/384kHz SPDIF to A-GD I2S exists .