I know it's been discussed here before, but I can't seem to find the right search strings to bring up the desired results.
What is the procedure for "Subtracting" one waveform from another ? For instance, after performing a
Vocal Cut or
Noise Reduction on a copy of a waveform, how do I then process the two waveforms (the original, and the modified) to leave me with only the material that was removed ?