In this tutorial we will be setting up two USB microphones, although you can follow the same steps if you are only setting up one. To do this we need to set up what is called an Aggregate Device.

 

Watch the video:

Go through the steps:

 

    1. Plug the two USB microphones into your computer.
    2. Open Finder and select Applications > Utilities >Audio MIDI setup. This will open Audio Devices. The list on the left shows the available microphones on your computer.
    3. Click the Add (+) button on the bottom-left corner in the Audio Devices window and chose Create Aggregate Device.
    4. A new entry appears in the list on the left side of the window. Double click it and rename the entry to USB microphones.
    5. Highlight the entry you just created called USB Microphones in the left list by selecting it. In the right panel, tick the checkbox for both USB microphones you have plugged in. Then click the checkbox to enable Drift Correction for both microphones.
      NOTE: GarageBand only supports a sample rate of 44100 (44.1K) and a bit depth of 16. To ensure reduced audio issues, set your audio source (microphone or audio interface) to match these settings. Garageband can tolerate other settings such as 24-bit, however if your interface supports 16-bit recording set it to that.

 

  1. Your USB microphones are now available for use. You can now close the application.