I’ll build on Matte’s comments by suggesting that you “tune” your filter by adjusting the frequency control so it removes as much of the noise as possible. Sometimes the noise isn’t exactly 60Hz.
Using the Hum Remove filter, adjust the Gain to a minus number to start removing some of the noise. Start with -15. Don’t worry how this affects the overall sound of your track just now. You’ll tweak later. Now slide the Freq control to get the most noise removal. Adjust the Gain control up or down to get the best sounding result. Don’t spend too much time on this right now.
The other control parameter to adjust is Q. This tells the filter how wide a range of frequencies around the center frequency (the one you just found) to remove. The wider the Q, the more of the “good” signal you’ll remove. Adjust the Q to be the narrowest it can be and still remove the noise.
At the bottom of the filter controls you’ll see a bunch of Harmonic check boxes. Harmonics are multiples of an original or fundamental frequency. Most hums aren’t just the fundamental. They are comprised of a number of harmonics added to the fundamental as well. The frequency you first chose by adjusting the Freq control is the fundamental. You want to choose as many Harmonic check boxes as make a difference in the noise removal. Choose at least the 2nd and 3rd harmonic.
After you’ve done this, tweak the Gain and Q to get the final result. Understand that it rare you will totally eliminate the noise and leave the original track unaffected. There’s a lot of trial and error in noise removal. There are third party plugins like Soundsoap that can do a better job than the Hum Remove filter, but they have their own issues, too.
Hope this helps.
John
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