If the problem appears to be global, then the next step is to reinitialize the system's core audio daemon process (coreaudiod), which is a persistent background process that handles audio. On rare occasions, a Mac preference file relating to audio devices may become corrupted. This can cause a device to not show up as an input/output device in System Preferences Sound even when there is nothing wrong with the device itself, or cause the device's MIDI ports to not show up.
Audio MIDI Setup User Guide
Use Audio MIDI Setup to set up audio input and output devices, such as microphones and multichannel audio interfaces. You can also use it to route audio from iOS and iPadOS devices directly into your Mac.
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Available settings in Audio MIDI Setup depend on the audio device you’re using. For example, you can adjust the volume for each channel your audio output device has available.
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Connect your audio devices to your Mac and, if necessary, install any software included with the devices.
In the Audio MIDI Setup app on your Mac, in the sidebar of the Audio Devices window, select a device.
Note: For iOS and iPadOS devices, first click Enable, then select the device. You may be asked to unlock your device with a passcode or to trust the device.
Control-click the device, or click the Configure Selected Device pop-up menu at the bottom-left of the sidebar, then choose how the device is going to be used:
For sound input: Choose Use This Device for Sound Input.
For sound output: Choose Use This Device for Sound Output.
For playing system sounds: Choose Play Alerts and Sound Effects Through This Device.
On the right side of the Audio Devices window, choose the options available for the device you selected:
In most cases, “Clock source” is set to the default.
Click the Format pop-up menu, then set the sample rate and bit depth. Make sure they match the appropriate settings for your audio device.
If your Mac supports the hardware sample rate converter, the Hardware Rate Converter pop-up menu is available in the Input pane. When you choose Automatic from the pop-up menu, the hardware sample rate converter is turned on if the audio samples coming in are PCM and formatted according to the international standard IEC 60958-3. The hardware sample rate converter is turned off if the input stream is encoded. You can also choose Enable or Disable from the menu, to keep the hardware sample rate converter turned on or off.
If software volume control is available for your device, the Volume sliders appear blue to indicate that they’re active. Drag the sliders to set the volume for each channel.
To set up a surround (multichannel) speaker configuration, click Configure Speakers, then set up the configuration.
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