Hey Mac users! Does your audio sound like the person speaking was at one end of a tunnel and the microphone was at the opposite end? Do the juxtaposition of large peaks and shallow valleys in your audio waveform clip or distort when applying a Volume or Gain increase?
Not to fear, as here we will walk through the steps of using our favorite free, open-source audio editing software (Audacity) to help increase the RMS level of your audio waveform aka how loud the audio sounds, without degrading the Noise Floor or clipping the highs, through the application of a Compressor effect.
Looking for Setup instructions? We’ve got you covered! Our recent Audacity for Mac OS X Installation Tutorial includes setting up LAME as well!
For today’s walk-through, we’ll be applying the Compressor effect using Audacity 1.3 Beta (Unicode) for Mac OS X.
Step 1: MP3 Download
Before one can edit their AudioAcrobat recording in Audacity, the first step is to make sure that the file resides on the hard drive of the computer on which editing will be performed.
1. Login to your AudioAcrobat account
2. Click Audio (L)
3. Click the Title of the Audio you wish to Download
4. Click Download Audio
Looking for Expanded Steps? Try HERE.
Step 2: Open in Audacity
Now that the file our readers wish to edit is on their computer’s hard drive, they will want to open the file with Audacity. Right-click the file and choose Open With and select Audacity from the list. Don’t see it listed? Open Audacity from the Applications folder in the dock. Open the software and click File >> Open, selecting the audio to be edited.
Once the file opens in Audacity, our readers will see something like this:
Click to Enlarge
Step 3: Highlight, Compressor + Export
It really is that simple. Click and drag with the mouse cursor or for those keyboard enthusiasts out there use Shift + Left / Right arrow keys to make a selection.
For the Compressor effect, our readers will want to make sure to select the area which encompasses the intended duration for which the effect is to be applied.
Here our readers will want to select Effect >> Compressor as seen below:
Immediately after selecting the Compressor effect, the following pop-up window will appear:
In today’s post, we played with each of the settings and applied the Compressor effect several times to achieve our goal of boosting the lows without sending them into the distorted land of clipping. The outcome will depend on the area selected and levels prior to applying the effect, along with any settings chosen in this popup window.
All modifications using the Threshold, Noise Floor, Ratio, Attack and Decay Time sliders, along with the Make-up gain for 0dB after compressing and Compress based on Peaks check boxes can be sampled before committing using the Preview button. Select OK to confirm the settings and apply the effect.
For a truly great break-down of what action each slider / check box provides, we recommend checking out the Audacity wiki HERE.
Looking at our final product, we see several quieter areas boosted, without clipping; which offers a much louder-sounding audio overall:
Click to Enlarge
When satisfied, select File >> Export to save the newly edited version and head over to AudioAcrobat in an internet browser to begin the upload process.
Well that was quick … we’ve already walked through the process of downloading and opening our file, applying a Compressor effect using Audacity for Mac OS X and exporting the file for upload to the Web … and yet it seems as though we had just begun. If you agree, go ahead and click the ‘Previous Post’ link beneath this article to continue the joyride!
Did you get stopped somewhere in the process? Make sure you have LAME correctly setup then shampoo, rinse and repeat the steps listed above. Success will be yours!
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Coming up next … #FolowFriday!
Posted by AudioAcrobat 
