The same as any other DAW, you assign the Kontakt VSTi to each MIDI track you want to use the Kontakt player on.

Sounds (no pun) like you are new to MIDI, DAW's and VSTi's?

Try watching this youtube all the way and don’t get flustered other him using Abelton and not Realband - a MIDI track is still a MIDI track

https://www.youtube.com/watch?v=9zFecOaD4CU


Larry


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