Try my mapping, its optimized for 4 decks on the iPhone.
http://www.djtechtools.com/forum/showthread.php?t=18397
Also unfortunately there is no way to display the actual text from a playlist - the arovia mapping is using a fader control to display the position of the cursor within your music library. On a side note the keyboard he implemented is pretty friggin awesome. I dont think I have room to do that on the iPhone effectively and I already own a keyboard/mouse app that I am using in conjunction with my OSC mapping to do typing in the search bar.
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