Max Air includes a dedicated mix minus bus. The Bus button on each channel includes that channel onto the mix minus bus.
The Mix Minus button phase inverts the signal on the strip, adds it to the mix minus bus, and routes the resultant mix minus to the channels Post Fader Direct Output.
This Mix minus system is extremely powerful as it is a single button press away and available on every channel. On-air production often requires on the fly changes to the microphone mix minus settings.
This Mix Minus system in addition to the Clean Feed/Group Matrix busses described earlier in the tour enables Max Air to offer an incredibly powerful array of bussing features that are found nowhere else on the planet.