Sound quality sounds fine to my tired ears and seems to be aac 128kbps, but what that equates to in mp3 I don't know. I believe that there are BBC video streams available with audio up to 320kbps but to capture those you need the m3u8 links which are well hidden. When watching a video on line, if you press F12 a bunch of code opens up at the food of the screen which is supposed to include m3u8 info.