So just to clarify, instead of having 2 outputs from my G65 to the FL and FR speakers I will now have just one output from the G65 carrying both FL and FR channels to the input of the 218, this then splits left and right and goes to my SE speakers.

Under normal operation (non MQA) I carry on as normal, (having told my G65 using the Meridian configuration software that I am now sending 2 channels on 1 output and that I have a 218 in the loop) but if I want to listen to MQA tracks I use Sooloos on the 218 and it will output in 2 channel to my SE speakers?

Do you need to get an updated version of the Meridian setup software that will have the 218 as a listed device?

G65, HD621, 5x DSP5200SE, MC200.