help getting frequency amplitude

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Hi,

I am trying to make a 3D animated figure dance to a song that is playing on the computer. To do this I plan to sample various frequency ranges and if the amplitude reaches a certain value then I'll make the figure move a certain way.

I don't know how to retrieve these amplitudes while the song is playing...those amplitudes that are effecting the Visualisation display that one sees when using a mp3 player like Windows Media Player.

I am writing my application in Visual C#.

Any Ideas?

Thank You,

Adam