I was surprised by this warning when I was opened a stereo project.

Additional option is required. Project "Endrum Mix" uses option "Surround" which is not enabled in your preferences. It is temporarily available while this project is active. Do you wish to have it enabled in the preferences?

Turns out an effect was using binaural panning. This means when using headphones, the listener will hear a simulated surround sound (after all you only have two ears for real surround sound too).


Interestingly even with the setting disabled in Preferences, I can still hear the effect with headphones as I drag around the puck…


I’m leaving it disabled since I don’t need all the actual surround features listed in Logic Pro X: Surround features overview. Hopefully that’ll also make Logic run faster.