I don't know what type of input jack is on the iPad as I am not familiar with those products. However the DP 32 has a mini USB Jack which is different than a micro USB Jack
Again - I'm not familiar with the iPad pro or other apple products for that matter - but at quick glance... it looks as though you need a "lightning to mini-usb" cable. In the DP manual there is a list of mac operating systems that are compatible.