ITS

Information Technology Services
Information Technology Services

Boost volume

How to Boost the Volume of an Already Recorded Audio File

  1. Download and install Audacity (opens in new window).
  2. Open Audacity.
  3. When you first open Audacity a "Welcome to Audacity!" popup will appear. Select OK.
  4. Select 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 select OK.
  6. Select Edit > Select > All to select the entire file
  7. Select Effect > Normalize...
  8. The default values should be fine. You can select Preview to see what it'll sound like. Select OK to apply the boost to the file.
  9. Select Transport > Play to listen to the result.
  10. Select File > Export... and select an appropriate output format.

How to Remove 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 Selecting where the hiss starts, holding, and dragging to where the hiss stops.
  2. Select Effect > Noise Removal...
  3. Select "Get Noise Profile".
  4. Select Edit > Select > All to select the entire file.
  5. Select Effect > Noise Removal... again.
  6. The default values should be fine. You can select Preview to see what it'll sound like. It's also a good idea to select the "Isolate" radio button and then to select 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 select OK to apply the filter to the file.
  7. Select Transport > Play to listen to the result.
  8. Select File -> Export... and select an appropriate output format.