Using QC as an audio interface - can't hear Spotify/Youtube etc?

Anybody know what may be going on? I’ve selected it as my interface for both and and out but nothing. Have my monitors connected directly to the unit and can hear guitar but nothing else.

Using a Mac btw.

Mac sound settings? I’ve been able to use my QC like this for general Youtube watching / etc. with no issues.

Is this correctly configured?:

More details on page 85 of the manual: https://downloads.neuraldsp.com/file/quad-cortex/Quad%20Cortex%20User%20Manual%202.1.0.pdf

My bad, I was running Out 3/4 to my speakers…!

You are still able to use Out 3/4 for hearing computer sounds. Run Audio Midi Setup on your mac, select QC in the left, then configure Speakers in the right panel and select Output 3/4.