Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
USB-C Extension Cable Success!
So far all the USB-C hubs I've seen come with ridiculously short pigtail connectors that are okay for a laptop on a desk, but that's about it. I've been looking for a USB-C extension cable but all the reviews indicate that they're hit or miss at best. I ordered a few to try out and have successfully used one to use with my hub connected to a MIDI controller and USB to 3.5 mm audio adapter while charging with the PD port on the hub.
This CableCreations cable works. I bought both the 0.3m and the 0.5m, but the 0.5m works great. I'm going to order the 1m cable next to push my luck. I haven't really stress tested it, and this isn't a long term test, just a proof of concept result so far. I don't have any need for the HDMI or Ethernet or SD card connections so I haven't tested those yet.
I'm also trying out these right angle adapters and they're working in combination with the extension. The result seems like it might put some torque on the iPad's connector though, so I'm not sure if I'll use them out side of special cases. Seems like the port would be better secured against the shorter leverage of on-axis strain rather than rotational strain, with more leverage to boot.
This cable was a total failure and is getting returned.