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How to change instrument with OSC

Hi,
My name is Jack,
It seems like the activation email of the community doesn't manage to be received by my email, so I am sorry to post my problem here.
Since I don't have any midi output device, I use JZZ.synth.OSC according to the "Hello MIDI" tutorial. It works well. However, when I tried to change the instrument(send(0xC0, 36)), the sound remain the same. Can anyone tell me how to change the instrument? THX!

here is the code:

<!DOCTYPE html>
<html>
<head>
<title>Hello MIDI!</title>
<meta http-equiv="X-UA-Compatible" content="requiresActiveX=true"/>
<script src="javascripts/JZZ.js"></script>
<script src="javascript/JZZ.synth.OSC.js"></script>
</head>
<body>
<h1>Hello MIDI!</h1>
<script><!--
JZZ.synth.OSC.register('Synth');
var port = JZZ().openMidiOut().or(function(){alert('Cannot open MIDI port!');});
function play(){
  port.send([0xC0, 36]).wait(500).send([0x90,65,127]).wait(500).send([0x80, 65, 0]);
}
--></script>
<button onclick='play();'> Press to play... </button>
</body>
</html>