Split audio should not have to be the same device you use for main out.

I would like the main output as my USB audio behringer device (easy enough) Now the hard part, while simultaneously giving me split audio out on the built in MAC OS headphone jack. i.e. Left ear main output and right ear pre cueing.

I’m sorry, Daniel, it is not possible to Split the Pre-Cueing into Main Output and Pre-Cueing Output.

I did not get that not selecting split but rather a stand alone precueing device on the devices screen does not stop you from selecting split cueing on the pre-cueing dialog. So esentially the feature I wanted was there all the time.