Even the basics confound me! I currently

Highlighted a portion of an audio that had pure white noise I wanted to use to remove from the whole track. Then got profile, adjusted bar, selected whole track by highlighting…but when I remove the noise and play it back it only removes the noise from the small sample area I used…not the whole track.

Can anyone figure out what I’m neglecting to do?

If still feeling magnanimous…this 1 track of 12 has the only usable section of white noise that runs through all tracks of this concert. Is there any way to use this one section on the other tracks as well?

Appreciate it more than you know!

Brenda K.

One of the problems of posting here instead one of the forums further up is we usually need to ask you which Audacity, all three numbers, and then which computer.


I appreciate the tip
Running XP on a Dell desktop
Audacity version is 1.26

Audacity 1.2.6 on an XP machine.

Have you exported your performance to a WAV file yet? Don’t process or add filters or anything, just Export As WAV to produce a safety copy. Audacity SAVE doesn’t make a sound file and you can get into trouble.

Close Audacity and restart the machine. Bring everything back up. Select the noise, capture the profile, OK, and the tool should close. This time Edit > Select > All. Did the whole performance get highlighted? Open up Noise Removal and apply it and see if it works now.


Thank you very much. The manual way of selecting the whole clip worked.

Now for what may be the real challenge. The clip that I sampled the hiss from was one audio file from many that make up a concert. None of the other audio files have the “pure hiss” needed to Noise Profile and remove. Is there a way I can apply this “profiled hiss” from this file to denoise the other files. It is the same exact hiss, volume, etc?

Thanks for lending me your expertise!

I think Audacity only forgets the old profile if you restart Audacity or you provide a new sample. So load the first show, capture the profile or noise sample, close the show (but not Audacity) and open up the new show. Apply the noise reduction and see what happens. I expect that to work.

This is assuming they all have the same sort of noise. If the character of the noise is different between the different songs, you may have troubles.


The easiest way is to select the “pure hiss” and Export it as a WAV file (using “Export Selected”). You can then import this audio clip into any project and use it for capturing the noise profile.

Thanks for following up so quickly koz. I will be giving this a try.
Just out of curiosity Stevethefiddle…when you import the pure hiss file. How does that become “attached” to the new file that you are trying to de=noise?

The imported “pure hiss” clip will be loaded as a second (very short) track. Once you have finished with it, you can delete it (click on the “X” to the left of the track name).

Koz’s provisos about the noise being of the same type are important. The closer the noise profile matches the actual noise that you are wanting to remove the better. The format of the noise sample must also be the same as the format of the audio that you are removing the noise from - for example, if the audio is “stereo 16 bit 44.1kHz”, then the noise sample must also be stereo 16 bit 44.1kHz".

Want to thank you folks a lot for taking the time to walk me through this stuff. It actually worked . Bit of a shame that even on the least noise removed setting, it still took out too much music and made the hiss into a mechanical background noise. But at least i learned how it’s done.


You can get rid of a lot of that in Audacity 1.3.6 (or whatever is current).

I do not like the noise reduction in 1.2.6 because of exactly your problem. There is no setting that works OK.

You can install both 1.2.6 and 1.3.6 as long as you don’t use them both at once. Pull a new noise sample in 1.3.6 and start with the settings: Delay 0, Frequency 500, and reduction about 18 dB. It should be a world of difference. Increasing the dB number will suppress the noise more. If the show starts to gargle, increase the frequency number. Don’t automatically go for the largest numbers, they can create damage, too. This tool in particular is a balancing act.



Many thanks for you hanging with me on this. Clearly, this is the major redeeming
part of the cyberworld…Solid people like yourself(and stevethefiddle) reaching out
and sharing your info with the un-enlightened hordes.

Good Karma back to you!