Creating a software vu meter

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Hello to everyone, after a lot of searching for a couple days and not getting anything useful can anyone help me/point me to how to get an audio stream while it is in the computer to make a vu meter, and then send the data to an atmega connected up to a couple of tlc5940 led drivers?
My problem is just getting the audio data, as it seems harder than anything, right now I am using ubuntu 10.04 and windows vista.
Thanks in advance for the time spent reading this question.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.