@isaac
I’ve used the CQ with OBS a lot on Windows and Mac and haven’t seen this before, but a few things to check:
See that Windows can see the CQ as a stereo input/output device – either by going through your sound settings or by using another app to record or stream some audio.
Check the audio settings in OBS and be sure that you have stereo selected and not mono or anything else.
Note that when switching to multitrack mode, the 1/2, 3/4, 5/6, and 7/8 input devices that Windows can see relate to the last 4 stereo pairs of channels on the USB connection, which are the ‘channel assignments’ set in the CONFIG / USB/SD/BT (symbols) / USB/SD screen. By default, the device labelled ‘7/8’ is the last stereo pair of channel assignments and is the main LR mix output.
Note also that the two modes of the CQ USB interface are actually seen as two different devices by Windows – one being a stereo USB audio interface and the other being a multichannel USB audio interface. It’s effectively like unplugging one device and plugging in another when you switch modes.
You could also try using the OBS ASIO plugin, which will allow you to access the CQ directly rather than through the Windows system.
Hope something here points you in the right direction, but you can always contact us directly through support.allen-heath.com
Thanks,
Keith.