Midi Synthesis in Java

The Synthesizer Object is a public interface which means that it can't be instanced with the new keyword. I put the code in the main method so you can copy/paste it into what ever file/class name ya want. To get the Synthesizer and open it, you have to use a few lines of code like this:

public static void main(String[] args) {
    Synthesizer synth = MidiSystem.getSynthesizer();
    synth.open();

MidiSystem is one of those "Don't need to instance it" objects, and here I use MidiSystem to get a fully working (almost) synthesizer. After we get the Synthesizer we need to open, why? I dunno, but you have to or it won't work!

Next, we get an array of MidiChannels which is what we'll actually use later to make a sound.

final MidiChannel[] mc = syn.getChannels();

I declare mc as final because we need to be able to access it without problems in the JButton's ActionListener later. So far this is straight forward and I think it doesn't get much harder than a bunch of method calls with several objects and interfaces.

Now, we want an array of Instruments to choose from. To do this we have to get a Soundbank object, I just use the default one with this line o' code:

Instrument[] instr = syn.getDefaultSoundbank().getInstruments();

Instruments are used to choose what instrument the sound is played with.

syn.loadInstrument(instr[90]);

Here I load into our Synthesizer, an arbitrary instrument from the Instrument array that we just made.