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Audacity

Basic Effects: An Overview

When you have finished recording your track, you can edit and modify different aspects of your recording using effects. Audacity has 29 effects, all accessible from the Effects menu at the top of the Audacity window. This document will provide an overview to six basic effects. For more information, refer to Adding Effects to Audio Files.

return to topAmplify

The amplify effect allows you to increase the volume in a selection of your audio track. This permanently changes the volume of the track as opposed to temporarily increasing the output volume. When adjusting the amplitude, Audacity automatically prevents you from increasing the amplitude to the point where clipping occurs. To increase the amplitude regardless of clipping, select Allow clipping. For more information on clipping, refer to Sound Track Basics: Clipping.
Amplify dialog box

return to topBass Boost

The Bass Boost effect enhances the bass in a selection of your audio track according to your specifications. This includes the frequency to which the effect is applied, and the number of decibels you wish to boost.
NOTE: The Bass Boost effect will not attempt to prevent clipping. It is recommended that you start with a small decibel level.
Bass Boost dialog box

return to topNoise Removal

The Noise Removal effect assists you in defining and eliminating unwanted background noise on your track. By selecting a section of your track that consists only of background noise, the Noise Removal effect determines what parts of your track qualify as background noise. You can then adjust how much of the background noise you want removed, preview it, and remove it. For further instructions, refer to Basic Effects: Removing Background Noise.
Noise Removal dialog box

return to topCompressor

The Compressor effect reduces the dynamic range of your audio track. The dynamic range is the difference between loud and soft parts of your track. You are able to designate what qualifies as loud and what qualifies as soft, how much the dynamic range will be compressed, and how long a loud part has to be before it is compressed.

Slider Definition
Threshold Designates at what volume the compressor activates. The further to the right the slider is, the higher the volume has to be before activation occurs.
Ratio Designates how much compression is applied. The further to the right the slider is, the more it will close the gap between loud and soft.
Attack Time Designates the amount of time the track goes above the Threshold before compression activates.

Dynamic Range Compressor dialog box

return to topFade In

The Fade In effect allows you to steadily increase the volume of your track from silence to the default volume over a designated period of time. The change will be visible on the Waveform.

EXAMPLE: If you select the first five seconds of your track and apply the Fade In effect, the beginning of your track will start in silence, and by the five second mark your track will be at the default volume.

NOTE: If you have selected a large section of your track to apply the Fade In effect to, a dialog box will appear momentarily. If you have selected a small section of your track, no dialog box will appear.
Fade In dialog box

return to topFade Out

The Fade Out effect allows you to steadily decrease the volume of your track from default volume to silence over a designated period of time. The change will be visible on the Waveform.

EXAMPLE: If you select the last five seconds of your track and apply the Fade Out effect, five seconds before the end of your track will be at the default volume, and the end of your track will be silence.

NOTE: If you have selected a large section of your track to apply the Fade Out effect to, a dialog box will appear momentarily. If you have selected a small section of your track, no dialog box will appear.
Fade Out dialog box

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