Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 88)

MAESTRO User Manual 84
3rd Step: Audio Sets
Figure 41. Stereo to Left and Right Front Surround Up Mix
However some customers report that their listeners prefer to always have
something in the center channel. Below in
Figure 42 , a center channel is
created by mixing the left and right signals together. The gain values are
adjusted lower in this case to present a consistent sound level.
Figure 42. Stereo to Left Front, Right Front and Center Surround Up Mix