Sound Writer vs MIDI Pro

Sound Writer is a 3D virtual music box, which can be played with easy finger gestures. Simply rotate the sphere in the middle of the screen by dragging it with your finger. When the pins on the surface of the sphere hit the "tone comb", sound will be played. You can also change the sound color and the layout of the pins by two finger gestures. Sound Writer, 2016 Idea: Peter Weibel Software Development: Chikashi Miyama

MIDI Pro provides practice opportunities and composition ideas. The app allows you to selectively mix percussion and melody tracks so you can play along with your preferred instrument. The generated MIDI sequences are a starting point for human composers to build upon and add more complex layers of instrumentation. A mixture of determinism and randomness is used to construct MIDI sequences that can be tailored to individual preferences.  The sequences are seeded with the selected rhythm, notes are are added using the selected key, scale and chord progression.   The outcome is a set of tracks that include the percussion plus 4 melody tracks that can be individually adjusted. With the paid version you can save midi files for reuse and or to import them into your favorite DAW.