You can make a custom Style using RealTracks, but they will not follow a specific entered pattern. RealTracks are always automatically generated and cannot be edited like MIDI can.
First, make sure you have all of the RealTracks that you would like in your custom Style loaded into the mixer. Then in the RealTracks Picker click on the [Save Style] button. Make sure you save your Style to the styles folder - where all of your other Styles are stored. Finally, open the Style Picker, click the Rebuild button, and do a Slow Rebuild.
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