First insert Kontakt in the synth rack. A pop up dialog should appear. Here is where you configure how you want Kontakt to work in your project. Pay attention to multi outs. You will want to select
All Synth Outputs. Click OK and X1 will start making multiple audio tracks.
Now you have Kontakt up and empty. No instruments are loaded. Toward the left top you will see a menu that has Files Libraries Database. Lets go to the database by clicking on it. You should see columns with type bank and timbre. For now select under type Piano/Keys. In the next column select Grand Piano. Look down below the database and you should see 3 pianos there. Select the last one which should be Grand Piano. You do this by double clicking on it. That instrument module will load. Now here is the hard part(not really)You should see the GP module with its name there near the top left. Just below it is output and just below that is the input.
The input should match your MIDI tracks output. I will get to that in a moment.
Be sure that the mixer is shown for Kontakt. There you will see some channel strips You add more if you need to up to the number of audio tracks you have created using that popup dialog that came up when you inserted Kontakt. Now you may need to set up the mixer for other channels. At the bottom the first channel will have 1/2 that is output 1 and 2. Nest if don't see a output in numbers just plus click on it and a dialog will appear. Here you select another out from the list. You do this for as many outs as you need.
For the first module it is set up by default most likely the way you will want. Now lets load another instrument module. Go back to the database and select organ. In the third column select vintage looking below Melotron Organ should be there. Double click on it and it will also load. Although the module is different the area above where the name is is the same as the piano the output will most likely be the first or channel 1. Change that to 2. Click on it and it will give you a drop down window that offers all the mixer channels setup in the mixer. You want the second one or as above 2.
The MIDI channel should also be changed to 2 if it isn't already.
Now you have Kontakt setup you need to go to your first MIDI track and select its output to Kontakt. The Inspector is a good place to go for this. If using the Inspector Go to the bottom of the inspector and select Kontakt.
Just below the FX bin you have 3 drop down widgets. The first sets the channel for Kontakt. The other 2 don't count with a soft sampler. They do with hardware.
If there is data in the MIDI track then play X1 by hitting the play button.
For the second MIDI track do everything the same except change the top channel widget to 2.
Repeat as needed.