How to Level Unequal Dialogue in Audacity

Balancing dialogue between two speakers with unequal volume levels in Audacity ensures a comfortable, professional listening experience. This guide explains how to balance audio whether the speakers are recorded on separate tracks or combined onto a single track, using manual adjustments like the Envelope Tool as well as automated processing like Compression and Loudness Normalization.

Method 1: If Speakers Are on Separate Tracks

If each speaker was recorded on their own microphone to separate tracks, leveling them is straightforward:

  1. Select Track 1: Click the track control panel on the left of the first speaker's track.
  2. Apply Loudness Normalization: Go to Effect > Volume and Compression > Loudness Normalization. Set the target to Perceived Loudness at -19 LUFS (for mono) or -16 LUFS (for stereo/podcasts), then click Apply.
  3. Repeat for Track 2: Select the second speaker's track and apply the exact same Loudness Normalization settings.
  4. Fine-Tune: Play both tracks back together. Use the Gain slider (- / +) on the left panel of either track to make small manual adjustments by ear if one voice still sounds slightly louder.

Method 2: If Both Speakers Are on a Single Track

When two voices share a single audio track, automated effects applied to the whole track can sometimes react unpredictably. You have two reliable solutions:

  1. Create a New Track: Go to Tracks > Add New > Mono Track (or Stereo, matching your source).
  2. Isolate the Quieter Speaker: Use the Selection Tool (F1) to highlight the sections where the quieter speaker talks.
  3. Move the Audio: Cut the selected audio (Ctrl + X on Windows or Cmd + X on Mac), click onto the new track at the exact same point in time, and paste it (Ctrl + V / Cmd + V).
  4. Normalize Separately: Once all dialogue from Speaker B is on the new track, apply Loudness Normalization to both tracks independently as described in Method 1.

Option B: Use the Envelope Tool for Manual Leveling

If you do not want to split the tracks, you can adjust clip gain directly on the waveform:

  1. Select the Envelope Tool (F2) from the toolbar.
  2. Click on the blue line at the top or bottom edge of the waveform where the volume difference begins. This creates a control point.
  3. Add another control point right where you want to boost or lower the volume.
  4. Drag the points upward to increase the volume of the quieter speaker, or drag downward to decrease the louder speaker.
  5. Switch back to the Selection Tool (F1) once the visible waveform sizes appear roughly equal.

Option C: Automated Compression and Limiting

If manual editing takes too long, you can use dynamics processing to automatically pull loud peaks down and lift softer speech up:

  1. Select the Entire Track: Double-click the waveform.
  2. Apply Compressor: Go to Effect > Volume and Compression > Compressor.
    • Set Threshold to roughly halfway between the quiet speaker's peaks and the loud speaker's peaks (typically around -18 dB to -24 dB).
    • Set Ratio between 2:1 and 3:1 for natural-sounding dialogue.
    • Set Attack Time to 0.20 secs and Release Time to 1.0 secs.
    • Check Make-up gain for 0 dB after compressing and click Apply.
  3. Apply a Limiter: Go to Effect > Volume and Compression > Limiter.
    • Set Type to Soft Limit.
    • Set Limit to (dB) to -2.0 dB to prevent any sudden loud spikes from clipping.
  4. Normalize: Finally, run Effect > Volume and Compression > Loudness Normalization at -16 LUFS to bring the overall finished dialogue to an industry-standard level.