How to create the sound bar when playing and recording wave ???

Hi,
    I 've created an app that can paly and record wave file.

And I want to make a sound bar that can display the intensity of the sound whenever playing and recording just like any record/play application provided by sound card.

How can I do that ??? The green,yellow and red bar seems difficult to make !?
Can I do that by simply calling API ???

Thank you!
surenechanAsked:
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chensuConnect With a Mentor Commented:
Look into my article at CodeGuru.

http://www.codeguru.com/misc/ADMixer.shtml

The Program 3. Wave Meter is what you want. You can easily do the same thing with the recording.
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GrailmanCommented:
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