# Quad Cortex Pro Tools USB Setup
**URL:** https://unity.neuraldsp.com/t/quad-cortex-pro-tools-usb-setup/21938
**Category:** Quad Cortex
**Tags:** support
**Created:** [April 18, 2026, 1:37pm UTC](https://unity.neuraldsp.com/t/quad-cortex-pro-tools-usb-setup/21938 "2026-04-18T13:37:29Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@MichaelStray](https://unity.neuraldsp.com/u/MichaelStray)
#### Post date: [April 18, 2026, 1:37pm UTC](https://unity.neuraldsp.com/t/quad-cortex-pro-tools-usb-setup/21938/1 "2026-04-18T13:37:29Z")
Hey Community!
I have setup an aggregate device on my mac mini with the QC and my SSL2+ Audio Interface selected. I then selected the aggregate device in pro tools and made sure that the inputs and outputs match with the I/Os in the midi setup on my mac but I get no audio sent to my speakers. I can see signal coming to my audio track in pro tools from the USB cable but no matter what output I select, I don’t get sound - not even from the click track. Is there anything I am missing? Any help would be much appreciated!
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### Author:  [@xush](https://unity.neuraldsp.com/u/xush)
#### Post date: [April 18, 2026, 2:16pm UTC](https://unity.neuraldsp.com/t/quad-cortex-pro-tools-usb-setup/21938/2 "2026-04-18T14:16:51Z")
What are the speakers plugged into?
Many of us aggregators use a monitor mixer for flexibility and not having to reroute cables. I haven’t had to troubleshoot it since I set it up so I’ll have to do some digging to recall the options.
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### Author:  [@MichaelStray](https://unity.neuraldsp.com/u/MichaelStray)
#### Post date: [April 18, 2026, 4:03pm UTC](https://unity.neuraldsp.com/t/quad-cortex-pro-tools-usb-setup/21938/3 "2026-04-18T16:03:07Z")
My studio monitors are plugged into the SSL2+ Audio Interface. I’ve attached my audio setup within Mac. I get audio coming into the audio channel in Pro Tools but no matter what output I select on the channel, I don’t get any audio which means that some routing has to be wrong in Pro Tools I/O. I just can’t seem to figure out what it is…
