What is the primary difference between FFT-based noise reduction and spectral subtraction noise reduction in vocal editing?

The primary difference between FFT-based noise reduction and spectral subtraction noise reduction lies in how they identify and remove unwanted noise from an audio signal. Spectral subtraction, the older method, operates by first analyzing a section of the audio that contains only the noise (a 'noise profile'). It then subtracts this noise profile from ....