I've been investigating if any of the Classic Trio(Talking Book, Innervisions, FFF) were recorded in quad. And I've come up with some conflicting info. Sorry, if this has already been covered, elsewhere. I did find this Interview with Robert Margouleff, where he discusses his history with Stevie. Interestingly, he mentions that they mixed in quad. Enjoy
https://www.theatlantic.com/enterta...opy-link&utm_medium=social&utm_campaign=share
https://www.theatlantic.com/enterta...opy-link&utm_medium=social&utm_campaign=share