GravSynth iPhone Synthesizer Lets You Improvise With Gravity

GravSynth is a new iPhone synthesizer (App Store link) designed to let users of any skill level to create improvisational musical performances. By tilting your iPhone (or iPod Touch), you can use changes in gravitational force to further control the application.

The $1.99 iPhone synth lets you improvise musical phrases “based off of the Lydian Chromatic Concept of Tonal Organization.”


GravSynth is comprised of analog synthesizer, arpeggiator and touch panel. Volume and pitch are controlled via the touch panel on the right allowing you play the analog synthesizer. As for arpeggiagtor, by using a combination of the eight touch panel pads on the left and different degrees of tilt, you can create a wide variety of musical patterns and phrases.

The musical phrases generated by the arpeggiator are based off of the Lydian Chromatic Concept of Tonal Organizaiton, an influential jazz music theory. Tilting your iPhone (or iPod Touch) vertically will reduce gravitational drag creating a high-tension musical phrase where as holding your iPhone (or iPod Touch) horizontally will increase gravitational pull and create a more stable musical phrase. In this way, manipulating the arpeggiator allows you to reproduce complex improvisational pieces of music in the same manner as a jazz performer.

Additionally, by using the 12 keys along the bottom and TapTempo, you can set the key and rhythm to match the song you are performing. Also, Tilting your iPhone (or iPod Touch) horizontally you can select the phrase speed with matching tempo.


  1. Musical performance via easy-to-use touch pad (including pitch and volume control).
  2. Arpeggiator controlled by varying combinations of gravity (tilt) and an eight pad touch panel.
  3. Phrase speed controlled by horizontally tilt.
  4. Keyboard with 12 different musical keys to choose from.
  5. Rhythm synchronization via TapTempo.
  6. Analog synthesizer

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