Pitch-shifting app to use w/ audiobus
I have one of those guitar multi-effects pedal boards, and I used to use it to do (sort of) looping, and one day I discovered that I could go into its preferences and change the order of the signal path, so that the "whammy pedal" effect came after the delay, and then I was able to do some really neat stuff with my loops. But the problem was it wasn't a real looper; I was just using a digital delay effect and setting the feedback to 100. So it was pretty limiting, and so I was delighted when Loopy came out and I was able to do real elaborate looping sessions on my iPhone. But the one thing I can't do is that pitch shifting stuff that I was doing with my pedal board.
So what I'm asking is, does anyone know of a good pitch-shifting app for iPhone that I can use on my loops (via audiobus)? I need something with a linear pitch-shifting control, like a whammy pedal. I could just route my iPhone into my guitar effects board, except it doesn't have a stereo input, and plus it would just be a lot simpler to have the pitch-shifting happen right in my iPhone.
Any recommendations? (bearing in mind I only have an iPhone, not an iPad)