After further tests we can confirm what is logical in some way: the iPhone and iPad hardware is similar powerful, so the iPhone operates as expected. In fact the question was already with the iPhone 4s, why Apple stiill limited this functionality to the iPad (the 4s was much more powerful than the  iPad 2, so why did the 2 have USB Audio/MIDI, the 4s not? I did not get an answer, of course...).

So UFX, UCX, Babyface and OctaMic XTC can all be used with the iPhone as they can with the iPad, as long as the iPhone has iOS 7. We just need to find out if this feature is limited to specific models, maybe the older 4 is excluded.

Also the same restrictions apply that I noted in post 69 here. For example the BF offers 192 kHz playback without resampling, as long as the 2 channel mode is active and the app in use supports that. Multichannel record and playback is no problem as I just tested with Multitrack DAW (the problem here is to find a DAW that runs on the iPhone at all - for example Auria and Cubasis do not). But typical DJ apps, like Djay/2 and Traktor can now run on the iPhone and have separated stereo outputs via the connected CC hardware, for mix and monitoring/phones.

This seems cool! However, I can't get it to work. After reading this thread, I went out and bought the CCK to use with my UCX  and iPhone 5. Did you jailbreak the iphone in order to make the CCK work? Or is there anything else I might be doing wrong?

Yes, it works completely without Jailbreak! As Daniel Fuchs wrote you only have to reboot UCX in CC mode. I successfully did many field recording jobs with it. E.g. a one day session with separate small lead accumulator. Even much better than old CCK over 30-pin adapter is the newer lightning to usb adapter.
Only power-connection of UCX is a little bit wobbly when using it while moving around with my setup. So you have to secure this connection to avoid power failure.

As I already wrote: Totalmix FX for iPhone would be fantastic!

That's the one I'm using...

Yes on both questions! Just updated them...

I suppose they're not going to do that before they're sure it really works. It's still not working with my UCX and iPhone 5 (and genuine Apple lightning to usb adapter).

I managed to power up my original Babyface only with a connecting bridging cable with two female ports, for one lightning cable and one USB cable for the Babyface, as well as one male that connects to a power supply. Without the supply it won't power up.

I can't get the Babyface recognized though. No audio out and I see nothing relevant in settings. I was hoping to be able to use my iPhone 5s with iOS 9 as a recorder tonight at a live gig, getting a signal off the desk.

Any advice or pointers?

Thanks for responding. I use the latter Cable as it fits without any adapter. While I have a camera adapter it's for older iPad with it's wider port to lightning.

I have to look into that class compliant mode. Didn't know I had to. This is in the manual? Searching…

There is an updated manual on our website to download. Also - quite obvious from the paper that you already downloaded - you need the lightning to USB camera adapter. The normal USB cable won't work.

Hello

I have an iPhone 7. If I connect it to a Babyface with a lightning to USB camera adapter, will the Babyface power the iPhone ? If not, is there another solution to power the iPhone while recording ?

Another question : which DAW on the iPhone would allow me to record in full multitrack using the Babyface ? I read here that Cubase won't work, but what about GarageBand ?

Thank you in advance

Query.
What kinds of combinations is iOS 12 & iPhone SE & FireFace UCX capable of while being plugged into Lightning-USB Camera Adapter via USB 2.0 or USB 3.0 cable?

Could I connect the FireFace UCX to my computer via FireWire, and be able to record both inputs and software outputs into a recorder with iPhone? Which recorder app would you recommend for multi channel recording?

I'd love to hear more about your experiences - and which apps you have decided to use. I guess the Lightning-USB Camera Adapter does not also power up the FireFace UCX via USB, so I have to have an external power supply unit plugged in.

Same thing but with my 6S plus, share the manual please

I can add now from experience that the software in the iPhone pretty much determines what one can do or not as I believe the hardware will run in class compliant mode, i e with OS drivers rather than RME. A few times I've had to restart everything in order for the software to recognize all channels.

In the case of the original Babyface I've had to exercise some patience getting it to power up into class compliant mode, but it never failed to do that after a number of attempts. Likewise I've had to remember to get it out of class compliant mode when putting it back into computer service.