Reading audio output from sound card using java
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After you send the music to the soundcard, it will be outside java to connect to the soundcard, as this will be low-level programming, so you will need to do some kernel-level programming that won't be trivial to do.
But, even if you go low, I doubt you will be able to click on the sound card and in front of the speaker.
You can intercept in front of the sound card, but it depends on your OS and the type of your sound card.
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