According to the Apple rules, Mac App Store apps can’t record system sound. However, Monosnap can use any audio input for recording audio. This means that the system sound can be recorded through the special emulator – fake audio device

Setup the audio device

  • To create an audio device with a system sound, you need to download the application called SoundFlower. You can download it from GitHub
  • Download and install file Soundflower-2.0b2.dmg

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Note: You can’t change volume on your mac as long as SoundFlower is turned on. That is why check twice the output level of sound on your mac and set it up to acceptable level beforehand

  • After that, you need to open Audio MIDI Setup. To find easily this application on your Mac, you can use Spotlight

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  • Open Audio MIDI Setup on your mac
  • Press the ‘+’ button in the bottom left corner and select “Create Multi-Output Device”

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  • On the right side, select “Built-in Output” and “Soundflower (2ch)”

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  • Press the button with the gear icon bottom left and select “Use this device for sound output”. Close Audio MIDI Setup

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  • To switch between Multi-Output Device and Internal speakers use sound preferences sound preferences in the status bar. For macOS El Capitan and lower: hold ⌥ and click sound preferences
  • If you haven’t this icon in the menu bar, go to System Preferences > Sound and turn on option Show volume in status barSound 2016-09-23 22-31-51
    Monosnap_2016-09-23_21-21-58
  • Look in picture below and set up same preferences in Monosnap

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  • After that Monosnap will be able to record system sound. If you want to record system audio and audio from mic simultaneously, set up same preferences as in the picture below
    OSX | Monosnap | Record video > Settings > Audio input (SoundFlower+Buil-in Micro)

    Note:

    • Check twice the output level of sound on your mac and set it up to acceptable level beforehand and only after that – switch to Multi-Output device

    • Always after working with Monosnap video recorder don’t forget to switch from Multi-Output device to Built-in Output
      If you ignore this step you’ll not be able to change system volume