Guitar Tuner is a Qt Quick example application that demonstrates the integration of Qt audio interfaces. The application can be used to tune guitar strings by analysing the audio recorded by the device microphone. The project is being hosted and developed at: https://projects.forum.nokia.com/guitartuner where you can read additional documentation on design considerations, check possible newer revisions, and also contribute to the project.
This app is created step-by-step in the Forum Nokia Hands-on Labs as well. You can build the logics of this app by yourself by following this tutorial: http://www.forum.nokia.com/document/Mobile_Hands-on_Labs/Qt/MobilityMMAudio/ and also create the Qt Quick UI for this app by following this tutorial: http://www.forum.nokia.com/document/Mobile_Hands-on_Labs/Qt/QtQuick/.
The initial version of Guitar Tuner, v1.1, was published in Forum Nokia Projects only.
The application is compatible with Symbian^3 and Windows desktop with Qt version 4.7.2 or higher.