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Queen's University
 

How to Boost the Volume of an Already Recorded Audio File

 

  1. Download and install Audacity.
  2. Open Audacity.
  3. When you first open Audacity a "Welcome to Audacity!" popup will appear. Just click OK.
  4. Click File -> Open and select the file you'd like to boost.
  5. A warning popup will appear. Select the "Read the files directly from the original (faster)" radio button and click OK.
  6. Click Edit -> Select -> All to select the entire file
  7. Click Effect -> Normalize...
  8. The default values should be fine. You can click Preview to see what it'll sound like. Click OK to apply the boost to the file.
  9. Click Transport -> Play to listen to the result.
  10. Click File -> Export... and select an appropriate output format.

Removing Hiss (if any) After Boosting the Volume

 

The boost applies to everything, so this is to be expected. Audacity has a noise removal filter that is pretty good at removing hiss.

 

  1. After you've applied the "Normalize..." effect, select a part of the file that is just hiss. You can do this by clicking where the hiss starts, holding, and dragging to where the hiss stops.
  2. Click Effect -> Noise Removal...
  3. Click "Get Noise Profile".
  4. Click Edit -> Select -> All to select the entire file.
  5. Click Effect -> Noise Removal... again.
  6. The default values should be fine. You can click Preview to see what it'll sound like. It's also a good idea to select the "Isolate" radio button and then to click Preview. This will let you hear what is being removed. If too much is being removed, you can play with the settings until you're happy. Once you're happy with the result, make sure the "Remove" radio button is selected and click OK to apply the filter to the file.
  7. Click Transport -> Play to listen to the result.
  8. Click File -> Export... and select an appropriate output format.

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