Many thanks as usual for the constructive suggestions. I just checked and it so happens I had the coloured connections in the right place. Everything is up and running, and I'm just now listening to David Gilmour's Live at the RAH on Blu. It is only 2ch through my Pioneer BDP-LX70 but at least it is now at 96K. It will take while to get listening impresions.

Audio goes LX-70 (or Oppo 980H) -> iScan VP50 -> HD621 -> 568.2MM -> L/R: Innersound Stereo Electrostatic amp -> Quad ESL 63; Centre: Innersound Mono ESLA -> Martin Logan Cinema; Subs: Stereo pair of JL Fathom f112s; L/R Rear: -> Quad 520f -> ML Script.

Home: BDP-103,G61R, HD621, Quad520f, 2xInnersound amps, 3xQuad ESL-63s, 2xJL Fathom F112 V1 subs, 2x Gradient SW63 subs.
iFi Zen Stream , Audeze LCDi4.