The Source section of the Down Mixer plug-in provides controls that let you mute, invert the phase, and adjust the level of each input channel to the Down Mixer.
When enabled, the Phase button inverts the phase of the channel input to the Down Mixer.
You can adjust the level of the channel input to the Down Mixer from –45 dB to +12 dB. For stereo to mono down mixing, both the Left and Right channels are mixed to summed mono. For greater-than-stereo multichannel down mixing, the following rules apply:
The level meters for source channels always show the input level (pre-fader) for the channel regardless of the Source Level setting.