[iicc]

>Can anyone make out if songs like this are specially mastered with separate vocal channels ... or if Apple is applying ML to do voice isolation

"Coupled with an ever-expanding catalog that features tens of millions of the world’s most singable songs"

"The vocal slider adjusts vocal volume, but does not fully remove vocals"

Based on the quantity and results it's ML like Spleeter (https://research.deezer.com/projects/spleeter.html).

[MBCook]

Oh good catch on that last bit. I missed it when reading through.