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An OTG hub with Power Delivery functionality will also power both the iPad and our bus-powered interfaces, so we strongly recommend the use of a USB-C hub of this type,
Using either a simple inline OTG adapter or an OTG hub, in our tests we found that all MIDI and audio works as expected, including audio pass through on iConnectivityMIDI2+ and iConnectivityMIDI4+.
Guys, I just bought a New IPad Pro 11” and a five dollars USB to USB TYPE C connector. I plugged it to my IC2+ interface and guess what... it works perfectly!!. I can transfer audio and manage outputs from Prime and the charging feature works fine (with external power supply 18w plugged to the IC2+). Great news for me... now the funny thing: I had big doubts about this (otg, iOS black magic, external powered hub, etc), so I put my IC2+ and the power supply in a bag, I bought the five usd cable and I did all this proof of concept directly in the Apple Store (MacOnline here in Chile), I said to the seller “Let me do this, If this works, I will buy the IPad”. It was a win win situation. Cheers.
Generally speaking, every single OTG cable and hub we have tested works. But obviously we can't test them all. We personally have had good results with the UGreen hubs. However manufacturers often change internal components without telling anyone, so even then we can't guarantee that one you get is the same. Chances are very good that it will work though.