This project uses the TouchOSC app on the iPad. Here a keyboard interface is used on the iPad to control synthesised sound in openFrameWorks. Visual feedback is given as random circles on the screen when a note is played.
A short video of operation is shown here:
The keyboard interface in TouchOSC is shown here:
One of the circles is shown in this screen shot:
To compile the code download the Synth.zip file which will contain the required files including README file explaining how to build and run the project.
All code can be downloaded here > https://drive.google.com/folderview?id=0B6DulS_REiNceGZKb0JRZ3pXVDg&usp=sharing