Thanks Asa. I am using MD1 as follows which I believe to be correct based on other posts here.

HD621 > G68
1/2 > D1=L/R,
3/4 > D3=C/LFE,
5/6 > D5=SURR

Sanjay


G68SL, HD722, 2x DSP 640.2 in-wall, DSP5200SE HC, 2x DSP 3200SE, G57+outdoor speakers, Roon Nucleus, Sony BluRay, Sony 4K 75" LCD, turntable setup