Behringer XR Mixer Pt 7, Understanding the morphing master level fader

This short video clarifies how the Master fader on the far right of the XAir interface changes depending on which 'Mix' you're viewing at any point in time. It's not complicated and is quickly explained, but it can confuse new users of digital mixers, so be sure you understand this area before using your mixer in an important live sound scenario.
The Behringer XAir app works on Windows 7 or later, Mac OSX, iOS (iPads/iPhones) and Android operating systems and can be downloaded from the link below for Windows/Mac machines or via the App Store on iOS and Google Play Store on android devices:
www.musictri.be/Categories/Be...
To view other instructional and professional development videos by Music EDnet for Music Teachers and individuals that are not included on our TH-cam channel, please visit our EDnet TV page at the link below:
www.musicednet.com/ednettv
*Please note; EDnet Hub membership includes full access to all EDnet TV content featured at the above link:
www.musicednet.com/EDnethub
If you'd like to discuss the purchase and customised assembly of a similar Mobile PA rack/digital mixer combo for your school or your own needs, or any other audio/video & music technology requirements, please contact Music Education Network via the options below:
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New Zealand: 0800 141 474
Email: [e-mail]
More info on PA and live sound equipment from Music Education Network can be found here:
www.musicednet.com/PA

[@TheLatinBlast]

What is the 'AUX' channel labeled in red to the left of the effects used for?