@Dawgstar ,
You are able to send any mix output to the 2x TRS Jack ‘Alt Out’.
However, what is your reason for wanting to use the Qu and the Apollo at the same time?
I only ask, as with this setup, you would be converting to digital, back to analogue and back to digital again (an extra two conversion stages) plus there will be increased latency (especially if it was to monitor UAD plugins whilst recording).
You could instead record the direct outputs from any/all channels on the Qu straight over USB and make use of the UAD and any plugins during post.
Or is this for streaming where you need it ‘live’?
Thanks,
Keith.