A newly discovered 1962 set from "a trove of live recordings that Granz had stashed away decades ago."
"Using a new engineering software that allowed him to more precisely isolate the instruments and Fitzgerald's voice, [drummer and producer Gregg] Field filled out the low end of the recording and brought her singing to the front."
Could that be iZotope RX7, @JonUrban?
https://www.nytimes.com/2020/10/01/arts/music/ella-fitzgerald-lost-berlin-tapes.html
"Using a new engineering software that allowed him to more precisely isolate the instruments and Fitzgerald's voice, [drummer and producer Gregg] Field filled out the low end of the recording and brought her singing to the front."
Could that be iZotope RX7, @JonUrban?
https://www.nytimes.com/2020/10/01/arts/music/ella-fitzgerald-lost-berlin-tapes.html