What does SIP mode mute when activated?

When SIP mode is activated, it specifically mutes the faders assigned to the Stereo Mix Bus. This function is typically used during live sound or recording sessions to prevent certain channels from being sent to the main mix, allowing for careful control over what is heard in the stereo output. By muting the corresponding faders in this mode, the operator can manage audio routing effectively without altering the overall balance of the mix. This enables the sound engineer to make adjustments or monitor audio without affecting the performance being sent to the audience or recording.

In contrast, other options such as aux channels, the main output, or direct outputs are not affected by the SIP mode, thus allowing for independent control among different audio paths. This distinction is crucial for achieving the desired sound mix while ensuring that certain channels can be muted without disrupting the overall audio output.