I'm kind of taken with Spinphony. I really like it. It's quirky and comes from an interesting idea in the first place.
- New Interface design eases use and streamlines computational internals.
- Version 1.5 now runs more smoothly on all supported platforms from iPhone 4 running iOS 7.1.2 all the way up.
- A fully customizable 'styles' option presents good sounding starting points when working with a new image.
- New audio filters applied to all internal synthesizers.
Spinphony is free on the app store