Comment by tonysavon

This is on stock C64 too :-). I guess the achievement here is using compression at such a high frequency. Once you get down to lower frequency, you can implement fancier compression schemes and add more stuff on display. The same author has compressed video plus compressed digi streaming from floppy disk here: https://www.youtube.com/watch?v=qIRww2a59lE But of course, that's not 48Khz and it sounds like that :-)