Sorry for all this noise! A new effect, "centercut" has just gone into sox_ng, dug out of the feature requests with patches on sox.sf.net, a more sophisticated version of "oops" that, instead of simply subtracting one channel from the other to remove the center, preserves the stereoness of the left and right channels while providing the stuff common to both on a third channel, the center channel, by means of a Fast Hartley Transform, separating the channels in the frequency domain and resynthesizing, so the "karaoke" effect with the center bass preserved in L and R is:
sox_ng in.wav out.wav centercut -b remix 1 2 There is an interim release sox_ng-14.7.0+git20251208 on https://codeberg.org/sox_ng/sox_ng/releases for anyone who would like to try this out, with a few other trivial bug fixes. M
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