Audio files are edited using waveforms, a visual representation of sound where amplitude and wavelength are displayed in a scrolling horizontal timeline. It’s the standard for all multimedia software, but waveforms lack the precision to dig deep into audio and alter specific areas, such as removing unwanted noise from otherwise good recordings. In recent years, software developers have adopted spectral audio editing, a method that displays audio as a vertical graph, using color and brightness to differentiate between frequencies.
Spectral editing has become mainstream enough that it’s now included as an option in free, open source tools like Audacity, as well as popular audio software Adobe Audition. If you’re looking to go all-in with spectral, there’s only one application designed entirely with this kind of audio editing in mind.