Sound output from MG3 on Mac

Hi folks. From the videos there is a bit where he shows an output going back into the A/D converter. Is there not a possibility to output with the Mac’s D/A output to monitors/headphones? Waiting to pull the trigger to know if I need a new A/D converter.

No idea what video you are talking about but you could use the Mac speakers or headphone output. However it is not really recommended to mix interfaces. Typically the return to the audio interface is done via USB and from there you go to your monitors.