iOS Audio Device selector?

I’m having trouble getting an Audio Device selector working on iOS. It only shows “iOS Audio”. However it shows the equivalent MIDI device.

I tried the demo app on my iPad and it behaves the same way:

Is there a way I can get the device name to show, so the user can choose between it and the onboard audio? Or is this not the way audio devices work on iOS?

I also need support for multichannel devices on iOS - See iOS Audio: can't access input channel 3 or higher

After doing some further research into this, it looks like iOS does not allow you to select which inputs and outputs it uses - it adjusts them automatically when a suitable device is connected.