Bee_Abney
How long have I been out?
No, this was a plugin that splits the music four ways. I think there are a few. Zynaptiq has a magical device that doesn't split them into separate output, but processes them separately so that you can alter tuning, tone and rhythm separately for different elements in real time. That's not something I need, but that does sound cool.Were you thinking of this? https://splitter.ai/ pretty incredible cutting edge stuff. really useful when remixing someone elses song, or wanting original vocal tracks for remakes etc.
Mind you, with services like Splitter, you don't have to have all the software yourself.