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I have a demo project based on the Iphone 2 track music sync demo. I have added two more sliders to the code, and changed the source of the music tracks. I have also changed the iphone screen to add 2 more sliders, making 4 sliders playing 4 tracks. I tested the code on the new music source with 2 tracks and it worked fine. It compiles with 4 tracks.
I haven't combined the two, in other word the storyboard is maybe complete, the code to run the 4 tracks is maybe complete, but the two are not working together.
I will provide the code / project and music tracks as a zip file and expect a working demo and project in return.