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I have an aiff file that's got a mixture of spoken word and music on it. I've isolated the frequency of the voice I want to enhance in the recording.

What tool within audacity would I use to bring out that frequency range and suppress the other frequencies in the spectrum?

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You're looking for an equaliser, which is an inbuilt effect in Audacity:

http://manual.audacityteam.org/man/equalization.html

Be aware that a voice is going to occupy more than a single frequency, and you'll need to play around to find a good setting. I find that the Preview button is very helpful here.

  • Thank you. I'll give that a whirl. I've been looking at the spectrum analyzer within Audacity and I can "see" the sound I want to isolate, so I'll fiddle with the equalizer to increase the volume of the sound's frequency band. – Adrian Jun 5 '17 at 14:01
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Thanks to endorph, I was put on the right path towards getting voices to stand out against a bunch of ambient noises. Here's what I did to clean up the audio:

1) Find a five second segment of ambient noise on the clip, highlight it, and go to Effect, Noise Reduction, create profile

2) Select the entire clip, click Effect, Repeat Noise Reduction

That got me to a clean starting state with the file. Next, I used the Spectrograph to figure out what frequencies the voices I wanted to stand out fell under.

Then, I highlighted the segment of the clip with those voices and clicked Effect, Vocal Reduction and Isolation. I selected Isolation and set min/max frequencies of the voice.

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After that, I used the Equalizer as endorph suggested, maxing out the frequencies I wanted to stand out and leaving the others alone.

enter image description here

Lastly, I went to Effect, Compressor and ran it on the file. I'm posting a complete answer to memorialize the steps in case someone else encounters the same challenge.

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