ArtooSynth

ArtooSynth is a synthesizer can be played with one finger.
Sound like "Astromech Droid Voice" though.
To the point that you have touch, you can display the colored circle. enjoy! :)

- You can play with one finger by touch screen.
- You move your finger on the screen to change the pitch.
- You are 5 color buttons at the top of the screen, you can choose the color of the circle of the touch point.
- When you shake the iPhone, it changes to the mode continuously changing color or size.

[sad beep] 2016 : The year we lost R2-D2 and Princess Leia.
RIP Kenny Baker
RIP Carrie Fisher

May the Force be with you.