Sibelius' Playback Configurations are not file specific (though it will "remember" which config it used last).
Click on the New button to create a new configuration. Then you'll have access to what you're looking for (assuming everything else is setup properly). A quick review of the setup instructions in the Readme may be useful.
Be sure to use the AU version of Kontakt Player.
Let me know how you get on.
Click on the New button to create a new configuration. Then you'll have access to what you're looking for (assuming everything else is setup properly). A quick review of the setup instructions in the Readme may be useful.
Be sure to use the AU version of Kontakt Player.
Let me know how you get on.