Some noises are not noise. A cough in a lecture, a chair in a string quartet, a phone in an interview: each sits in one place on the spectrogram, and a denoiser, which subtracts what is steady, leaves them alone. This takes them out one at a time.
Draw the box
Load the file and the spectrogram appears under the waveform, time left to right and frequency bottom to top on a log scale. Drag over the mark to draw a box. Click a box to select it, press Delete or the button to remove it, and click anywhere else to move the playhead. Up to 64 boxes are kept in the link, so a repair survives a reload and can be handed to the workflow.
Fill or attenuate
Fill replaces every bin inside the box with the average that bin carried over the Context window before the box: 800 ms by default, longer for a steadier fill, shorter to follow a texture that moves. The bin keeps its own phase, so the frames still overlap coherently and the edges of the box are invisible on room tone.
Attenuate turns the box down by the Attenuation amount instead. It keeps whatever shape was inside, which suits a sound to keep that overlaps the one to remove.
Both modes feather the box over 20 ms in time and two bins in frequency, so an edge is a fade rather than a click.
Where it stops
A cough over speech cannot be replaced with the speech that was under it; the fill restores the room and the words stay missing. A box drawn over a whole band for a whole phrase is an equaliser with extra steps, and the denoiser or the hum remover is the better tool for anything steady. For a click shorter than a few milliseconds, the declicker finds and interpolates it without a box.