Using a sound blaster G3 USB-C sound card with a headset. Headset is detected and chosen by the phone automatically as both the audio output and microphone input. However there is no sound on the headset or microphone recordings. If I use the line-in on the card to my PC I get audio from the PC while the card is plugged into the phone. This suggests that the device is correctly powered and started. I can also change settings on the card from my phone and they apply correctly. I have already tried changing the USB audio routing in developer settings. I'm running latest software update.