Using Sound with Processing

The easiest method I've found for playing sounds in Processing is using
the "Minim" sound plugin. You can download it and read the
documentation at http://code.compartmental.net/tools/minim/. Note that the Manual is not completely written yet, but many of the key features are documented there.

The
easiest way to play a sound with Minim is to use "sound snippets", as
in the Processing (NOT Arduino) code shown below. Before using this
code you'll need to install Minim as described on its website and put
the attached sound file in the same directory as your Processing code.

import ddf.minim.*;
import ddf.minim.signals.*;

AudioSnippet snippet;

void setup()
{
size(100, 100);
Minim.start(this);

snippet = Minim.loadSnippet("Submarine.aiff");

}

void draw()
{
}

void keyPressed()
{
if ( key == 'p' )
{
snippet.play();
snippet.rewind();
}
}

void stop()
{
snippet.close();
}

Another possibility is Ess (http://www.tree-axis.com/Ess/index.html). The website has several cool examples.