How to Generate Binaural Beats in Audacity

Audacity is fully capable of generating custom binaural beats for relaxation, meditation, and brainwave entrainment experiments. By using its built-in tone generator to send slightly different audio frequencies to the left and right stereo channels, you can target specific brainwave states without needing specialized software. This guide covers how binaural beats work, the exact steps to create them in Audacity, and the standard frequency ranges used for mental entrainment.

How Binaural Beats Work

A binaural beat is an auditory illusion perceived when two pure tones with slightly differing frequencies are played separately into each ear through stereo headphones. The brain processes the difference between the two tones as a rhythmic pulse. For instance, if a 200 Hz tone is played in your left ear and a 210 Hz tone is played in your right ear, your brain perceives an entrainment frequency of 10 Hz, which corresponds to the alpha brainwave state.

Step-by-Step Guide to Creating Binaural Beats in Audacity

To create a binaural beat track, follow these steps:

1. Create the Left Channel Tone:

   • Open Audacity and go to Tracks > Add New > Mono Track.
   • Click on the track to select it.
   • Navigate to Generate > Tone... (or Generate > Waveform... in newer versions).
   • Set the Waveform to Sine.
   • Set your base frequency (for example, 200 Hz).
   • Set the amplitude (e.g., 0.5 to prevent clipping) and define the track duration.
   • Click Generate.
   • On the track control panel on the left, slide the Pan slider fully to the Left (L).

2. Create the Right Channel Tone:

   • Go to Tracks > Add New > Mono Track.
   • Select this new second track.
   • Navigate to Generate > Tone....
   • Keep the Waveform set to Sine.
   • Enter the offset frequency based on your desired brainwave state. For a 10 Hz beat using a 200 Hz base, enter 210 Hz.
   • Set the amplitude to match the first track (0.5) and ensure the duration is identical.
   • Click Generate.
   • Slide the track's Pan slider fully to the Right (R).

3. Export the Audio:

   • Go to File > Export Audio....
   • Choose an uncompressed format such as WAV (Microsoft 16-bit PCM) or high-bitrate MP3. Lossless formats like WAV preserve the exact sine wave shapes without compression artifacts.

Brainwave Target Frequencies

When selecting frequencies for brainwave entrainment, keep the carrier tone below 1,000 Hz (values between 100 Hz and 400 Hz are most effective) and calculate the difference to match your desired mental state:

• Delta Waves (0.5 Hz – 4 Hz): Deep, dreamless sleep, pain relief, and deep healing.
• Theta Waves (4 Hz – 8 Hz): Deep meditation, REM sleep, creativity, and memory processing.
• Alpha Waves (8 Hz – 13 Hz): Calm focus, stress reduction, and positive thinking.
• Beta Waves (13 Hz – 30 Hz): Active concentration, analytical thinking, and problem-solving.
• Gamma Waves (30 Hz – 50 Hz): High-level cognitive processing, peak concentration, and information recall.

Listening Requirements

For brainwave entrainment experiments to work, the listener must use stereo headphones or earbuds. Standard speakers mix the sound waves in the open air before reaching your ears, creating monaural beats rather than triggering the neurological processing required for true binaural entrainment.