Apple appears to have pulled the latest macOS Mojave Security Update, as well as the Safari 14 download for macOS Mojave, after users ran into a slew of problems. So, it’s possible that you are yet to get the Mojave update alert because Apple server is just too busy. Another reason could be that your Mac is running an older version of High Sierra (or Sierra, El Capitan, etc.), you should get update notifications but not related to Mojave. Instead, you were prompted to update to the latest subversion.
After installing macOS Mojave or later, you might see an alert that says audio input isn't accessible when trying to record. Or you might not hear sound, see waveforms, or see audio meters move when recording. To record audio, allow the app to access audio inputs:
- Close the app you're using to record audio.
- On your Mac, choose Apple menu > System Preferences, click Security & Privacy, then click Privacy.
- Click Microphone.
- Select the checkbox next to an app to allow it to access the built-in microphone on your Mac, an external USB mic, or the inputs on an external audio interface.
- Open the app and try to record audio again.
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If you're using an external microphone or an external audio interface to record audio and it's still not working, check with the manufacturer of your device for software updates and information on compatibility.
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Here are some more resources to help with recording audio: