What function do the stereo sources serve when assigned to the Grand Master Fader?

When stereo sources are assigned to the Grand Master Fader, their primary function is to control the overall mix for sub mixes and groups. The Grand Master Fader acts as a global level control for the audio output, allowing sound engineers to adjust the combined levels of multiple channels or groups of channels simultaneously. This makes it easier to manage the final output of a mix without needing to adjust each individual fader, thus streamlining the mixing process.

By integrating stereo sources into this master control, engineers can achieve a cohesive sound across all tracks and submixes, ensuring that all elements of the audio production blend well together. This capability is particularly essential in live sound reinforcement or complex studio sessions, where balancing numerous elements is crucial for achieving a polished final product.