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In Audacity [1] X Study Source , each channel will have an amplitude envelope controlled by the amplitude tool ( Envelope Top ) on the Tops Topbar . Amplitude coverage implies you can control smooth channel volume changes over time. People who work in the recording industry sometimes call this technique vpume automation , because in the studio you usually change the volume of channels by moving the audio sliders up. and down, and fancy harmonic controls that remember your shifts and automate them ever since. Controlling the amplitude of a channel in Audacity is similar, except that Envelope Top is used to create and manipulate control points at different points on the channel. The control points then determine the changes in volume over time.
Steps
Introducing Envelope Top
- Before you select the Envelope Top knob from the Tops Topbar , your channel should usually look like the image below:
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/2/21/Envelope0.png/460px-Envelope0.png”,”bigUrl”:”/images/thumb/2/21/Envelope0 .png/580px-Envelope0.png”,”smallWidth”:460,”smallHeight”:130,”bigWidth”:580,”bigHeight”:164,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - As soon as you select Envelope Top , the channel now has a thick blue border at the top and bottom of the waveform, like the image below:
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/c/c2/Envelope1.png/460px-Envelope1.png”,”bigUrl”:”/images/thumb/c/c2/Envelope1 .png/579px-Envelope1.png”,”smallWidth”:460,”smallHeight”:130,”bigWidth”:579,”bigHeight”:164,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - This is an example of ‘ amplitude envelope’ applied to a channel. The volume is attenuated gradually between 9-11 seconds, and then rises again much more rapidly over the next half-second (note the gradient of the blue line is much steeper). The volume is proportional to the pitch of the waveform – the smaller you have the waveform, the louder it will sound:
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/e/e8/Envelope4.png/460px-Envelope4.png”,”bigUrl”:”/images/thumb/e/e8/Envelope4 .png/579px-Envelope4.png”,”smallWidth”:460,”smallHeight”:131,”bigWidth”:579,”bigHeight”:165,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - The amplitude envelope is controlled by a number of control points. Each control point is visible with 4 handles (small circles in the image above), with which you can drag the point up or down to control the volume level.
- Note : You cannot use Envelope Top to fade in/out for a selected sound to or from amplitude 0. To do this, use one of the fade/fade effects. .
- Click anywhere on the channel to create a control point.
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/3/3b/Envelope2.png/460px-Envelope2.png”,”bigUrl”:”/images/thumb/3/3b/Envelope2 .png/574px-Envelope2.png”,”smallWidth”:460,”smallHeight”:122,”bigWidth”:574,”bigHeight”:152,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - The entire channel will follow your new control point until you add another control point. Click another point to add a new control point.
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/b/b5/Envelope3.png/460px-Envelope3.png”,”bigUrl”:”/images/thumb/b/b5/Envelope3 .png/576px-Envelope3.png”,”smallWidth”:460,”smallHeight”:124,”bigWidth”:576,”bigHeight”:155,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - The sound will always change smoothly between control points, so you just need to add as many control points as you need. You can click on the top half or bottom half of the channel to create a new control point. If you have a stereo channel, the same amplitude envelope will apply to both channels.
- If you want to place a new control point very close to an existing one, then Audacity can have a hard time handling the situation and will try to move the existing point rather than create a new one. Sometimes it’s easier to press away from an already existing point and then drag it closer.
- If you are amplifying a quiet segment, you can amplify outside the original volume envelope of the channel by snapping at any of the internal control points. When you do this, Audacity cannot fully display the shape of the envelope and changes the border to a dotted line in the affected area:
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/f/f8/Envelope5.png/460px-Envelope5.png”,”bigUrl”:”/images/thumb/f/f8/Envelope5 .png/581px-Envelope5.png”,”smallWidth”:460,”smallHeight”:131,”bigWidth”:581,”bigHeight”:165,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”} - However, you can make the enlarged amplitude envelope visible by shrinking it vertically.
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/2/25/Envelope6.png/460px-Envelope6.png”,”bigUrl”:”/images/thumb/2/25/Envelope6 .png/578px-Envelope6.png”,”smallWidth”:460,”smallHeight”:132,”bigWidth”:578,”bigHeight”:166,”licensing”:”<div class=”mw-parser-output” ><p><a href=”/index.php?title=B%E1%BA%A3n_m%E1%BA%ABu:Screenshot&redlink=1″ class=”new” title=”Bu1ea3n_mu1eabu:Screenshot (page chu01b0a u0111u01b0u1ee3c viu1ebft) )”>Bu1ea3n_mu1eabu:Screenshot</a>n</p></div>”}
- Multiple volume changes can make a channel harder to work with, so sometimes if you’re sure you’ve got them tuned right, you might want to replace the original original channel and its control points with a new one. A new channel with amplitude envelope changes is returned to that waveform and thus its control points are/are removed. To do this, select the channel you finished and press Tracks > Mix > Mix and Render . This option is sometimes called Bounce in other software. The resulting channel will sound the same but will no longer have its amplitude control points.
- Naturally, you can always add controls later, or get all the original controls back by undoing the Mix and Render command if you’re not satisfied with it. As an alternative, you can choose the command Tracks > Mix > Mix and Render to New Track to allow you to return a new channel without the amplitude bound points but keep the original original channel with the points. amplitude envelope. This allows you to easily pilot on a “ clean ” visible channel by adding additional amplitude envelopes while still being able to use the Mute or Spo knobs to compare the original channel.
Recommendation
- Audacity is free, open-source, platform-independent software, dedicated to recording and editing audio. So it is a very good tool for creating audio digital resources, used for open access, open licensed and open educational resources.
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, volunteer authors have edited and improved the article over time.
This article has been viewed 1,877 times.
In Audacity [1] X Study Source , each channel will have an amplitude envelope controlled by the amplitude tool ( Envelope Top ) on the Tops Topbar . Amplitude coverage implies you can control smooth channel volume changes over time. People who work in the recording industry sometimes call this technique vpume automation , because in the studio you usually change the volume of channels by moving the audio sliders up. and down, and fancy harmonic controls that remember your shifts and automate them ever since. Controlling the amplitude of a channel in Audacity is similar, except that Envelope Top is used to create and manipulate control points at different points on the channel. The control points then determine the changes in volume over time.
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