How to Create Reverse Reverb Vocal Swell in Audacity

The reverse reverb vocal swell is a classic production technique used across horror sound design, modern pop, and electronic music to introduce a vocal track with an eerie, sweeping buildup. In this guide, you will learn how to produce this ghostly effect step-by-step using only the free, built-in tools available inside Audacity.

Step 1: Isolate and Duplicate the Vocal

  1. Import your vocal track into Audacity.
  2. Highlight the first word or syllable that you want the swell to lead into.
  3. Press Ctrl + D (or Cmd + D on macOS) to duplicate the selected portion onto a new track directly below the original.
  4. Mute the original vocal track for now so you can focus on processing the swell.

Step 2: Add Silence for the Reverb Tail

The reverb effect needs empty space to generate a trailing decay before being flipped.

  1. Click at the very end of the isolated vocal clip on the new track.
  2. Go to Generate > Silence.
  3. Set the duration to roughly 2 to 4 seconds, depending on how long you want the swell to last, then click Generate.
  4. Select both the vocal audio clip and the generated silence block, then press Ctrl + J (or Cmd + J) to join them into a single audio clip.

Step 3: Reverse the Audio Track

  1. Double-click the duplicated track to select the entire clip (the vocal plus the silence).
  2. Go to the top menu and select Effect > Special > Reverse (or Effect > Reverse in older Audacity versions).
  3. The audio will flip backward, placing the silence after the reversed vocal.

Step 4: Apply a Heavy Reverb

  1. With the reversed clip still selected, go to Effect > Delay and Reverb > Reverb.
  2. Dial in the following settings to ensure a long, pronounced decay:
    • Room Size: 80% to 100%
    • Reverberance (Decay): 80% to 100%
    • Wet Only: Checked (this isolates only the reverb sound, removing the dry signal)
    • Stereo Width: 100%
  3. Click Apply. The silence after the reversed vocal will now be filled with the decaying reverb tail.

Step 5: Reverse the Audio Again

  1. Keep the track selected.
  2. Go back to Effect > Special > Reverse.
  3. The track will flip back to its original forward orientation. The long decay tail is now inverted, transforming into an eerie riser that swells upward into the initial vocal hit.

Step 6: Align and Blend the Tracks

  1. Unmute your original vocal track.
  2. Select the Time Shift Tool (or click and drag the clip handle in newer Audacity versions).
  3. Slide the reversed reverb track along the timeline so that the peak of the swell lines up seamlessly with the exact moment the original vocal begins.
  4. Adjust the gain slider on the left panel of the swell track to blend the volume to your liking, ensuring the riser transitions smoothly into the main performance.