How to Create Chords in Audacity Using Tone Tracks

Audacity allows you to synthesize musical harmony by generating individual tones on separate audio tracks and playing them back simultaneously. By calculating the specific frequencies for each note in a chord and generating them as distinct waveforms, you can build custom polyphonic chords like triads and seventh chords. This guide explains how to identify your note frequencies, generate the individual tone tracks, balance the mix to prevent digital clipping, and render the final chord.

1. Determine Your Chord Frequencies

Because Audacity generates sound based on Hertz (Hz) rather than musical notation, you must first determine the frequencies of the notes in your desired chord. For a standard C Major triad (C4, E4, G4), the standard equal-temperament frequencies are:

If you want to add an octave (C5) or a major seventh (B4), you would use 523.25 Hz or 493.88 Hz, respectively.

2. Generate the Root Note Track

  1. Open Audacity and create a blank project.
  2. Go to Tracks > Add New > Mono Track.
  3. Click on the newly created track to select it.
  4. Go to Generate > Tone... from the top menu.
  5. In the dialog box:
    • Waveform: Choose Sine for a pure tone, or Sawtooth/Square for a richer, more synth-like harmonic profile.
    • Frequency (Hz): Enter your root frequency (e.g., 261.63).
    • Amplitude: Set this to 0.3 instead of the default 0.8. Lowering the amplitude is crucial because stacking multiple tones will add their amplitudes together.
    • Duration: Set your desired chord length (e.g., 00h 00m 03.000s for three seconds).
  6. Click Apply or OK.

3. Layer the Remaining Chord Tones

  1. Go to Tracks > Add New > Mono Track to create a second track.
  2. Select the second track, then navigate to Generate > Tone....
  3. Keep the same waveform, amplitude (0.3), and duration as the first track, but enter the frequency for the third of the chord (e.g., 329.63 for E4).
  4. Click Apply or OK.
  5. Repeat this process with a third new mono track for the fifth of the chord (e.g., 392.00 for G4).

4. Balance the Mix and Prevent Clipping

When multiple audio tracks play simultaneously, their signals combine in the master output. If the combined peak exceeds 0 dB, distortion and digital clipping will occur.

  1. Press Spacebar to play back the layered tracks.
  2. Watch the Playback Meter at the top of the interface. Ensure the green bar stays below 0 dB.
  3. If the meter enters the red or hits 0 dB, lower the track gain sliders on the left control panel of each individual track by -2 dB to -4 dB until the master meter peaks around -3 dB to -1 dB.

5. Mix and Render into a Single Polyphonic Track

Once your chord is balanced, you can merge the separate note tracks into a single unified file.

  1. Select all the active tone tracks by pressing Ctrl + A (Windows) or Cmd + A (Mac).
  2. Go to Tracks > Mix > Mix and Render.
  3. Audacity will combine the individual frequencies into a single polyphonic track representing the complete chord.
  4. Go to File > Export Audio to save the final chord in your preferred format (WAV, MP3, or FLAC).