Yes, i have thought of that once, thanks for reminding me. I am so focused on transparent speech compression that I forgot about a more lossy speech encoding method. So with zstd compression you could reach 30 bps of bandwidth, cloning your voice and your communication partners voice with a voice font and perhaps also clone a personal conversation style with Dia https://github.com/nari-labs/dia - you might get close to the 'natural' conversation.