How to Select an Audio Interface in Audacity

Setting up an external audio interface as your primary recording device in Audacity ensures high-quality sound for voiceovers, podcasts, and music production. This guide explains how to properly connect your hardware, select the interface within Audacity's audio settings, configure your channels, and test the input signal to start recording immediately.

Step 1: Connect the Audio Interface to Your Computer

Plug your audio interface into your computer using the appropriate USB or Thunderbolt cable before opening Audacity. Ensure that any necessary manufacturer drivers (such as dedicated ASIO drivers on Windows) are installed. Connecting the hardware first allows your operating system and Audacity to detect the device automatically.

Step 2: Open Audacity and Rescan Devices

Launch Audacity. If the program was already running when you plugged in the interface, it may not register the new device immediately. Refresh the device list by navigating to Transport in the top menu, hovering over Rescan Audio Devices, and clicking it.

Step 3: Choose the Interface as Your Recording Device

In modern versions of Audacity, device selection is handled through the Audio Setup button located on the top playback toolbar:

  1. Click the Audio Setup button.
  2. Hover over Recording Device in the drop-down menu.
  3. Select your external audio interface from the list (it will appear under the brand name, model, or as a generic USB Audio Codec).

(Note: If you use the classic Device Toolbar, look for the microphone icon and select your interface directly from the adjacent drop-down menu.)

Step 4: Configure Audio Host and Recording Channels

  1. Click Audio Setup again and select Host. On Windows, choose MME or Windows WASAPI; on macOS, select Core Audio.
  2. Click Audio Setup, navigate to Recording Channels, and select your track format:
    • Choose 1 (Mono) Recording Channel if you are recording a single microphone or instrument.
    • Choose 2 (Stereo) Recording Channels if you are recording a stereo pair or multi-input mix.

Step 5: Test and Monitor the Input

Before recording, verify that Audacity is receiving the signal from your interface:

  1. Locate the recording meter (indicated by a microphone icon).
  2. Click the meter where it says Click to Start Monitoring.
  3. Speak or play into your microphone.
  4. Check the green meter bars to confirm an incoming signal. Adjust the physical gain knob on your audio interface so that your peaks hit between -18 dB and -6 dB, avoiding the red zone (0 dB) to prevent audio clipping and distortion.