Can you collect an example? Like, record through the air (e.g. with a digital audio recorder maybe even in your phone) a few seconds of the distortion you are hearing and share it somewhere? Does it sound any different through headphones?
Fwiw, I have zero problems with voice output on my linux machine with rando audio hardware, including usb-audio dongles that often come with headsets. -- Russell Senior russ...@personaltelco.net