Momo Müller has released a iPhone version of his Roland Aira TB-3 Editor for TB MIDI Stuff. Once again this requires TB MIDI Stuff to use, and the layout itself is an additional €5.
I've been having a lot of fun with the iPad version. I didn't even realize how much Roland had exposed in the latest update. You can tweak the hell out of your patches now!
The TB-3 is no longer "a preset player" but a full synth, with a deep effects engine to tweak.I've seriously lost an hour just perfecting the distortion on a single patch.
He's also released an editor for the Aria TR-8 drum machine, which is also just €5 on his website.