I made an iPhone version of my Reface system editor, because sometimes my iPad is busy with other tasks, when I want to quickly change some settings of my Reface. This layout allows to switch (nearly) all of those functions, which are not directly accessible in the Reface CS, CP and YC, quickly and conveniently from your iPhone. Even for the DX it might be useful at times.
Please see more explanation about the layout here: http://mididesigner.com/qa/5995/layout-reface-series-system-editor
Enjoy!