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adobe audition has a built in preset under dynamics for de-essing... if yoru looking to remove line hiss/line noise... highlight a couple seconds of "blank space" and save a sample of the fft noise in the NR effect... go back and highlight the whole track, go back to FFT NR and select your saved nise sample... and de-nise the whole track... it works like magic once you get used to tweaking the settings.
I have used it to remove all MANNER of things that I didnt think I could get rid of.
tip: for typical line noise, the presets work fine... if you wanna take out sneakers thumping in a clothes dryer (dont ask...lol), you CAN do it, you just have to apply the reduction in stages, and spend a couple hours tweaking.