Different Frequency Beeps/Sounds

Question

I want to be able to make sounds or beeps of a specified frequency and a specified duration. I can't seem to find out how to do this.
All I have been able to find is java.awt.Toolkit.beep() which all it does is beep. I have also looked at the javax.sound.midi and java.sound.sampling packages but even if I opted to go that overly complicated route I still can't find any information that helps me enough where I could actually use those to do what I want.
Anyone know a way to do this?

Answer 1

This is about the coolest diversion I've ever had:
import javax.sound.midi.*;
* @author Ian Schneider
public class Noise {
    public static void main(String[] args) throws Exception {
        java.io.InputStream in = System.in;
        Synthesizer synth = MidiSystem.getSynthesizer();
        synth.open();
        MidiChannel[] channels = synth.getChannels();
        Soundbank bank = synth.getDefaultSoundbank();           
        synth.loadAllInstruments(bank);
        Instrument instrs[] = synth.getLoadedInstruments();
        int b = 0;
        final int cnt = instrs.length;
        while ( (b = in.read()) >= 0) {
            int v = in.read();
            Patch p = instrs[in.read() % cnt].getPatch();
            channels[0].programChange(p.getBank(),p.getProgram());
            channels[0].noteOn(b/2,v/2);
            Thread.sleep(in.read() * 2);
            channels[0].noteOff(b/2);
        synth.close();
}Examples:
Hear what your memory sounds like:
cat /dev/mem | java Noise
Hear what some java classes sound like:
find . -name \*.class | xargs cat | java Noise
Enjoy