[priorytools]

ADC will compensate for the D > A & A >D of a hardware insert . . but not what happens to the signal whilst it's out in analogue world before coming back . . There is no "ping" function.

This isn't the issue in your case as you are just sending to additional outputs,(the pair), via an aux channel in parallel to the individual outputs. .

May I ask why you need to go to a stereo aux & then out ? Are you processing that pair with a plug across the aux ? If so, make sure you can see the ADC on each channel in your mix view. Check that the figure on the aux isn't red .

From memory I think the delay for sending to an aux bus is 10 samples. But that shouldn't be a problem. Try activating "compensate for delays after record pass" in the I/O set up. . Both in & out .
PT manual page 91.
Let me know if that works .