We have confirmed that noise occurs under connection with some Apple products* with a Lightning connector via Lightning to USB Camera Adapter.
*Models confirmed with problems in connection via a USB camera adapter: iPhone XR, iPhone XS, iPad 8th generation
For details and the latest information on support, see "Connecting to an iPhone/iPad".
This symptom may be improved by using the Lightning to USB 3 Camera Adapter.
Left: Lightning to USB Camera Adapter
Right: Lightning to USB 3 Camera Adapter