This sample code is built to generate a range of sine tone, from 10Hz to 44kHz. The first draft of code stimulated from the post at http://marblemice.blogspot.com/2010/04/generate-and-play-tone-in-android.html and http://audioprograming.wordpress.com/2012/10/18/a-simple-synth-in-android-step-by-step-guide-using-the-java-sdk/ Also refered to another blog http://webtutsdepot.com/2011/12/03/android-sdk-tutorial-seekbar-example/ to create the slider bar.