Hugh H : The cables from the turnable are going straight into the RME Fireface. There is no “turntable” input as such on the Fireface. It will be straight into normal mic/line I/O, and I expect I will use the onboard pre-amps.
NWP : I will check VST Connections. I assume from your steer that it is fairly obvious how to combine the inputs - I think bring the two monos in under the Device Port list and make them up as a Stereo Bus. Anyway, I’ll take a look tomorrow.