Grass Valley Maestro Master Control Installation v.2.4.0 - Manual (Page 169)

MAESTRO Installation and Service Manual 169
3rd Step: Audio Sets
Figure 87. Stereo to All Output Groups Mix
Figure 88 shows an input table where there is only a surround audio source
available, and a stereo down-mix is created. The values used for the down-
mix create a Lo-Ro (Left only/Right only) mix for the stereo output, while
passing the Surround version with 1:1 mapping.