On macOS, you can combine several audio interfaces so that they appear and act as a single aggregate device.
To use a different audio device for output than for input in WaveLab, or to extend the number of inputs and outputs available to you, on macOs, you can combine multiple audio devices and create an aggregate device.
Prerequisite
You have connected all external audio devices that you want to use.
Procedure
Follow the detailed step-by-step instructions on the official Apple Support sites.
Tip
We recommend using “Aggregate Device” as a search term.