Did some more tinkering today and found another cool use for this app. One thing I've never liked in a surround mix is when the lead vocals are present in all channels at full volume - maybe it's my system, but I find that the vocal never quite centers right in the middle of the room like it's supposed to and it makes the other discrete elements in the mix seem less apparent somehow. However, with spleeter it's possible to take an all-channel vocals surround mix and turn it into a SW-esque center-only vocals mix!
I took the song "Workin' Up A Sweat" from Alice Cooper's
Muscle Of Love (AF 4.0 SACD) and generated two isolated vocal stems, one from the front channels and the other from the rears. I then inverted them and mixed them back into audio they were generated from, canceling the lead vocal altogether. Finally, I mixed the two stems together, pasted them into the center channel, and tweaked the center volume until it felt balanced.
I think it sounds much better this way - in my car, the lead vocals are now pinned right in the center of the dash instead of appearing everywhere, but the backing vocals are still present in the rears
Original:
View attachment 51224
New:
View attachment 51225
Here's a 20-second sample of how the rears sound with the vocal removed - I found that the backing vocal lines over the chorus are much more noticeable than they are on the original mix.