All true. However FM radio always has white noise, so adding a little bit to it is probably better than adding any correlated noise from signal processing. FF

All true. However FM radio always has white noise, so adding a little bit to it is probably better than adding any correlated noise from signal processing. FFT noise reduction definitely has its place and I do use it from time to time. I just highly doubt "live on-air signal processing" is a good application given that the noiseprint is constantly changing.