A simple way to make a custom Real Style is to first manually load all of the RealTracks/RealDrums you wish to have into your song. This is done in the RealTracks Picker.

To open the RealTracks Picker, click on any track in your mixer window. Then in the menu go to Select RealTracks | Select RealTracks. Choose your RealTracks then click the Close button to load it into the Mixer. https://youtu.be/nbf9P496sy0

After you have loaded all of the RealTracks you wish to be in your custom Style into the Mixer, open the RealTracks Picker again. Inside of this window, there is a Save Style button. This will save the current Style with the RealTracks that are currently loaded in the Mixer.

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Best,
Chantelle