Is Unity's built-in audio engine FMOD Studio (FMOD 5)?

  1. FMOD 4 is out of support now, so they are not receiving fixes or improvements from us, however they do have a source license and have been maintaining the code themselves.
  2. None immediately come to mind, there are existing integrations with Unity, Unreal and CryEngine though.
  3. The “Disable Unity Audio” project option is what the setup wizard ticks for you, doing that and removing the listener should be sufficient to fully disable Unity built-in audio.
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