What is the primary function of the CTRL PGM button?

The primary function of the CTRL PGM button is to select internal stereo sources. This button is crucial for managing audio inputs within the system, allowing the operator to switch between various internal sound sources seamlessly. When this button is activated, it typically enables the user to access pre-defined internal audio streams, which can be vital in applications such as broadcasting or live events, where different audio feeds need to be managed efficiently.

Internal stereo sources often include music tracks, sound effects, or other audio content stored within the system. By utilizing the CTRL PGM button, users can ensure that the desired internal audio is routed to the output, providing a coherent listening experience. This function is central to the operation of audio mixing and control systems, highlighting the importance of the CTRL PGM button in professional audio management.