Assigning More Audio Outputs Than Your Hardware Supports

You can assign more outputs than your current audio hardware supports, allowing you to open sequences with multichannel output settings on computers that don’t have professional audio interfaces connected.

If you select an audio output that exceeds the number of output channels of your audio interface, Final Cut Pro warns you that you will not hear tracks assigned to unavailable outputs. However, you are still allowed to use this preset. You may want to choose or create such a preset when: