Noise Removal - Cleans up noise from a recording. First, select a small piece of
audio that is silent except for the noise, select “Noise Removal”, and click on the
“Get Noise Profile” button. Then select all of the audio you want filtered, select
“Noise Removal” again, and click the “Remove Noise” button. You can experiment
with the slider to try to remove more or less noise. It is normal for Noise Removal
to result in some distortion. It works best when the audio signal is much louder
than the noise.
Normalize
- Allows you to correct for DC offset (a vertical displacement of the
track) and/or amplify such that the maximum amplitude is a fixed amount, -3 dB.
It’s useful to normalize all of your tracks before mixing. If you have a lot of tracks,
you may then need to use the track gain sliders to turn some down.
Nyquist Prompt
- Allows you to express arbitrary transformations using a powerful
functional programming language. See the Nyquist section of the Audacity website
for more information.
Phaser - The name “Phaser” comes from “Phase Shifter,” because it works by
combining phase-shifted signals with the original signal. The movement of the
phase-shifted signals is controlled using a Low Frequency Oscillator (LFO).
Repeat - Repeats the selection a certain number of times. This operation is quite
fast and space-efficient, so it is practical to use it to create nearly-infinite loops.
Reverse - This effect reverses the selected audio temporally; after the effect
the end of the audio will be heard first and the beginning last.
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