Gaz Williams posted an nice rant on new problems faced by iPad Pro owners with the removal of the headphone jack in the 2018 model. Due to the way iOS automatically swaps to newly connected audio devices, it can suddenly swap to a connected USB C Hub if that hub offers a headphone output. This is even the case when you do not have headphones plugged into the hub's headphone jack.
This can be avoided if you intentionally buy a hub without a headphone connection. This is yet one more aggravation in the clusterfuck of Apple's bone-headed move to try to sell more high-latency Bluetooth AirPods.
The fairly new iPad Pro 3rd generation has replaced the lightning port with a much more useful USB C port but the removal of the headphone socket spells trouble for musicians who require super low latency. This USB hub by EUASOO has a headphone socket but that causes a certain issue...