Demudder

A UVR feature incoming (it was also explained before on the server by Anjok - if something is not clear, try to find his messages there)

 

It uses lots of phasing tricks. It processes the track twice. The first takes instrumental from the first go around and compares it against the original mixture. It chops the mixture into 3 second chunks and ?inerts over that lists of chunks and for each segment, it cuts out where that segment is in the instrumental, and it finds similar events that aren't at the exact same place. It takes those chunks, and it analyses them against the instrumental that was generated, and it tries to find the most similar events it can from the instrumental, that aren't at the same place from that segment, and it finds similar events, and then it phases it, it does a phase invert of that instrumental

(56:30) If the volume or DB threshold isn't past the certain point because it's too loud then it means it does not cancel out and doesn't make phase invert, if it reaches a certain threshold like if it is below certain threshold it'll phase that, and then it will basically stitch together a new mixture that is kind of phased from that original instrumental output, and it reprocesses that new stitch together, mixture with the phase with the instrumental phase changed, and it processes that through the second pass, and then it takes that vocal and then phase inverts it with the mixture, with the original mixture and then what you end up having is some of the parts that are similar from the other parts of the track, you end up having those fill in the spectral holes.

Sam remarks find some similarity with probably how Izotope Imager works.

Anjok says: I'm trying to get a similar part, but also try to take it and phase it with that segment. Because it's not the exact same part of the segment, it's not gonna be a perfect phase, because it would be an original vocal output.

So it's kind of still finding the bit of instrumental that is still in the vocal.

 

Sam remarks about frequent situations where you perform separation, and it can lead to decrease of e.g. hi hat volume levels in instrumental, referring to what information separated vocal stem can wear. It's part of the muddiness Anjok tried to address with the feature.

Anjok didn't want to compromise vocal quality, and in some cases it makes the vocals better too, but it also depends on how the track was mixed originally. If it's an analog track recorded in one session or even a live track, it won't work so well. The problem is with e.g. 10 minutes track, when demudder won't find phase similarities so effectively. It will work the best on music made with samples. If the track is digital, it is more likely to work better.

Anjok currently works on it to make it work for all tracks.

 

The more he works on it, the more breakthroughs are made, but due to his day job, he had less time to work on it lately.

 

Anjok gives his appreciation to the group of very talented developers who made MDX-Net arch in the University of Korea. It's his favourite network. He's a big fan of Woosung Choi's work.

 

In 2026, Anjok started identify as she/her (ref).

_____

 

Later, Aufr33 invented his own: