How to Record 32-Bit Float Audio in Audacity

This guide explains how to configure Audacity for 32-bit float recording to prevent irreversible digital clipping. While traditional 16-bit and 24-bit audio formats permanently distort when signals exceed 0 dBFS, 32-bit float preserves dynamic range far beyond standard digital maximums. Below, you will learn the necessary hardware prerequisites, the exact settings to adjust in Audacity, and how to recover audio that appears visually clipped on your timeline.

Hardware Prerequisite

Audacity operates internally at 32-bit float by default, but true clipping prevention requires an audio interface or field recorder with 32-bit float analog-to-digital converters (such as devices from Zoom, Sound Devices, or RØDE). If your microphone preamp clips at the hardware level on a standard 24-bit interface, changing settings in Audacity will not recover the lost data.

Step-by-Step Audacity Configuration

To ensure your incoming signal is written directly to a 32-bit float track:

  1. Open Audacity.
  2. Open the preferences menu by pressing Ctrl + P (Windows/Linux) or Cmd + , (macOS).
  3. Select the Audio Settings tab from the left sidebar (labeled Quality in older versions).
  4. Locate the Quality section.
  5. Set the Default Sample Format dropdown menu to 32-bit float.
  6. Ensure your Default Sample Rate matches your hardware's setting (typically 44100 Hz or 48000 Hz).
  7. Click OK to apply the changes.

Next, configure your input device:

  1. Click the Audio Setup button on the top toolbar.
  2. Under Recording Device, choose your 32-bit float-capable interface.
  3. Under Host, select WASAPI (Windows) or Core Audio (macOS) to ensure bit-perfect transmission from the driver to the software.

How to Recover Clipped Audio

When recording loud sources, waveforms that exceed 0 dB will appear flat-topped and trigger red clip indicators on the meters. Because the file is recorded in 32-bit float, the data above 0 dB is fully intact.

To restore the clipped signal:

  1. Select the affected audio track by clicking its track panel or pressing Ctrl + A (Cmd + A).
  2. Navigate to the top menu and select Effect > Volume and Compression > Amplify.
  3. Enter a negative value in the Amplification (dB) field (for example, -6.0 dB or enough to pull peaks below 0 dB). Alternatively, use the Normalize effect set to -1.0 dB.
  4. Click Apply.

The flat-topped peaks will immediately recalculate into smooth, rounded audio waves without any audible or digital distortion.