I replied to another topic. But this seems to be the same issue so I'll just copy over my replies from the other topic.
I have the same issue on a galaxy S8+.
This happens on the audio output for the entire phone. Does not matter if audio is playing to phone speakers, audio jack or bluetooth headphones.
How to easily replicate:
1: Play music with spotify or other app.
2:open discord/skype (or other voip app that enables 'call mode' on the phone)
3:open a voice call with the app.
-you should now immediately notice a drastic and unbearable decrease in sound quality for the entire sound output of the phone.
I noticed this because I have terrible cellphone reception in my area and wanted to use discord over wifi as an alternative but as soon as the call opens the audio quality is reduced to a level which I am not able to understand what my father(reduced voice due to illness) is saying.
This is a dealbreaker for me and I am seriously considering returning the phone and switching to a brand which does not have this problem. I have read on some discord and skype forums that Huawei and samsung phones have this problem while some pure android phones and other brands does not.
This seems like a pure software issue and should be rather easy to fix for a big company like Samsung. I would rather not switch brands as I have gotten used to samsung phones and have gotten my entire family to get Samsung phones.
But if it isn't fixed I will have to.
