Spectral editing has become the new thing IMO. It got big with iZotope RX (audio repair tools), but now seems to be coming in other apps and in DAW’s. I had just posted about the impressive Reaper update 5.50 the other day, and it now includes spectral editing. SLP4 seems to be taking it a step further, at least visually from what I can tell. I like how it’s very 3-D.
If you have ever seen a spectrogram of a song or any sound, that’s the visual representation of the sound spectrum. A spectral editor gives you a toolbox of ways to edit that spectral ‘waveform’ in ways we previously were unable to do. In iZotope RX, it gave you the ability to go beyond “noise reduction” and actually remove specific sounds from the audio - like someone in the room coughing or dropping something on the floor. I’m sure there will be tons of ways we can alter things now too, if desired.