Sometimes you may need to record audio from a device that is not connected to the camera, this may be the case if you need to record a lecture where the camera is far away from the audio source, or you need to conduct an insta 360 tour and you would like very high quality audio. In addition you could sync multiple cameras to one high quality sound source (such as a podcast recording).... the synchronisation feature in Adobe Premiere is a highly useful technique made surprisingly simple.