Similarity / Phantom Center Extractor model

Added a center channel extraction model. It is very similar to the Center Extract effect in iZotope RX, but works better.

It separates the song into two tracks:

mid refers to the phantom center, meaning the part that contains instruments and vocals perceived in the center.

side refers to everything perceived in stereo.

You can find this model in the Extract Backing Vocals section. Although it does not isolate vocals, it can be useful in your work.

Example song:

Mid:

Side: