I can't map my controller to an instrument track.

You need to hit the plus button in the upper right hand corner of the window under "Channel Strips" to add a software instrument channel strip. Then you need to insert the instrument into the channel strip. I would suggest reading "Work with channel strips" in the MainStage help.

After loading Kontact, does it show up in the "Plug In Manager . . ."? "Plug-in Manager is a drop down menu under the Mainstage 3 menu tab. If it is not there, try rebooting. If that doesn't work, try re-installing Kontact and reboot.

Once Kontact shows up in the Plug In Manager, it should just be a matter of creating a new software instrument strip and selecting the Kontct instrument from the drop down menu behind the "Input" tab in the top half of the channel strip.

Hope this helps.

Did you Assign each one of your new bank of control knobs to the physical controller in the Layout view?

The problem you are having is that your channel strip was created at the concert level. That means that you need to select the concert and create the mapping there. The alternative is you can create the channel strip at the patch level instead, and then you will be able to map it at the patch level.

Also it looks like your channel strip is not set to sit on the keyboard (which should be the default, so maybe you changed something in the drop down when creating the channel strip. You can fix this by selecting the channel strip, choosing the midi input tab, and then changing what is set as the "keyboard" in the drop down in that inspector.