I'm currently using the ipad apps for Omnisphere and Alchemy. I know Rocket has one, and as it's only way to save patches seems like a necessity. Otherwise I'm not certain how much an ipad app for a hw synth would get used. I have a Mopho and see that SoundTower put out an ipad app for it, but I've heard that the cpu based versions were pretty wonky. Anyone use this?
I also use Lemur, but I find some of these other apps to be a bit more dynamic. What else is out there?