Klevgränd has released Baervaag, which they describe as an easy to use, but still powerful and tweakable, FM synthesizer. They say that during development, focus has been on creating a playable and expressive instrument with an intuitive interface. In addition to the FM synthesis there's a LP filter, a "wobbler" (for that analogue touch) and a stereo chorus under the
Baervaag is compatible with both iPhone and iPad (AUv3), and also available for desktop as AudioUnit and VST.
Pricing and Availability:
With an intro price (~35% off) Baervaag for iOS costs $4.99 and Baervaag for desktop costs $12.99.