Articles / Gear iPhone 4 Gyro Gesture Music App September 11, 2010 1 comments An iTheremin in the palm of your hand. The iPhone 4's improved gyroscope and gesture sensors inspired app designer, Henry Chu to create SoundGyro. The app turns the iPhone 4 into a theremin sounding gesture controlled instrument. Theremin-like Posted by omhoge September 11, 2010