Got a Pixel 6, and started to have some issues, having people telling me that the volume of WhatsApp voice messages was very low and kinda muddy. As recommended by support I reset my phone and uninstall and re-install all apps. I ran several test on Telegram, Whatsapp, FB messenger and Instagram. In the recordings: The worst is WhatsApp (I have to increase the volume to 100% to hear anything). Instagram is acceptable, the best one is FB Messenger. I tested with the same volume, distance, message).This helped me realize that there is a volume gap between the lower mic and the upper one. So the upper one is bit better, a bit louder (as in talking next to the selfie camera ) so I have to talk to this mic so people can hear me (it is weird I'm telling you). I tested using a Bluetooth headset and the issue is the same, for some reason the volume and quality sucks. Surprisingly using the Recorded app the audio quality is just fine, so this seems to be an issue of compatibility of the Pixel 6 with 3party apps that use the microphone. I had a OnePlus and never have this issue. Great recording/audio quality. I am seriously regretting the switch.