Java sound visualizer - java

i'm trying to make a java sound visualizer, but I have absolutely no idea on how to get the bytes from the audio extracted, immediately after they are procressed in real-time. I could synchronize the program with an wav file, but that is not what I want to do, I want to generate the sound with the program, then play it, without saving it anywhere.
Thanks for the help!

This article can help you understand the structure of sound files: Build an Audio Waveform Display

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