Quad Cortex as audio interface totally disappeared

Quad Cortex Bug Reports
1

CorOS Version: 3.2.1

Hi,

I’m beginning to cry with this issue.

I have my QC connected via USB to my computer as an audio interface. It worked perfectly until a week ago.

Now I can’t see my QC as an interface anymore and it doesn’t appear in device manager (not even within hidden devices). When I plug in a guitar to the QC, sound is coming out as it should on my speakers and my headphones but still nothing comes out or goes in the computer.

The unit is functionnal on another computer (Laptop).

I did everything I could to try to resolve the issue:

- Tried a couple usb cables and nearly every USB port of my computer

- Rebooted an ungodly amount of time, turned my computer completely off

- Removed and reinstalled the NeuralDSP drivers (v5.58.0) several times

- Updated BIOS of motherboard (now v1820)

- Updated Windows 11 (v25H2)

- Updated Intel Pilots (using their Assistant)

- Updated NVIDIA pilot (I’m desperate, I know) (v581.57)

- Reset my QC to factory.

- USB Statistics in the QC shows USBConnected as “Yes” when plugged in and “No” when not

- Contacted NeuralDSP support who told me: “There could be a variety of things that have caused this issue. I’d recommend checking Microsoft support or forums, and additionally seek advice from your CPU manufacturer about possible causes of fixes.”

NOTHING WORKS. I AM VERY SAD.

SPECS:

Processor : Intel Core i7-13700F

Graphic card : Nvidia GeForce RTX 4070 Ti (12Go)

Motherboard : Asus TUF B760-PLUS WiFi D4

If this helps: when the problem started, I was working on the Guitar Pro 8 software and turned on my speakers (Eris 4.5BT), which are connected to the QC via jack to XLR cables. Then the program crashed and then I noticed that I didn’t have my QC as an audio interface anymore.

Can someone please help me? This seems to be a software issue but I can’t resolve it.

Thanks in advance.

2

Man, sounds like you have gone through a lot diagnosing the issue. I see where you stated that it all works as it is supposed to using another computer so at least you eliminated the QC being the issue which is good. Have you by chance installed any other USB drivers recently? If so, I recommend to uninstall for now. Otherwise, I would suggest looking at your event viewer for system, applications and hardware and see if that tells you anything helpful. To me it appears there may be a conflict possibly with another driver. Lastly, please look at your events around the time of the software crash and see if that tells you anything.