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Polyphonic/accord example #5

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53 changes: 51 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,55 @@ function play(keys) {
play([[660, 0.1], [660, 0.1], [660, 0.1], [510, 0.1], [660, 0.1], [770, 0.1], [1, 0.1], [380, 0.1]]);
```

Wanna go polyphonic? Ok, here's an example of how to play accords (multiple keys at once):

```javascript
function play(keys) {
var key = keys.shift();
if(typeof key == 'undefined') return;
if(typeof key[0] == 'object') {
for(i = 0; i < key.length; i++) {
if(i==key.length-1) { // last one
new Beep(22050).play(parseInt(key[i][0]), key[i][1], [Beep.utils.amplify(8000)], function() { play(keys); });
} else {
new Beep(22050).play(parseInt(key[i][0]), key[i][1], [Beep.utils.amplify(8000)]);
}
}
} else {
new Beep(22050).play(parseInt(key[0]), key[1], [Beep.utils.amplify(8000)], function() { play(keys); });
}
}

play([
// accords:
[ [349, 0.08], [391, 0.08] ],
[ [349, 0.08], [391, 0.08] ],
[ [349, 0.08], [391, 0.08] ],
[ [349, 0.08], [391, 0.08] ],
[ [349, 0.08], [391, 0.08] ],
[ [349, 0.08], [391, 0.08] ],

[ [329, 0.08], [391, 0.08] ],
[ [329, 0.08], [391, 0.08] ],
[ [329, 0.08], [391, 0.08] ],
[ [329, 0.08], [391, 0.08] ],
[ [329, 0.08], [391, 0.08] ],
[ [329, 0.08], [391, 0.08] ],

[ [293, 0.08], [493, 0.08] ],
[ [293, 0.08], [493, 0.08] ],
[ [293, 0.08], [493, 0.08] ],
[ [293, 0.08], [493, 0.08] ],

// single tones:
[440, 0.08],
[493, 0.08],

// an accord again:
[ [261, 0.1], [523, 0.1] ]
]);
```

API
===

Expand All @@ -79,10 +128,10 @@ Methods

Generates a list of numbers representing samples of the sine wave.

#encode(number:frequency, number:duration, [function:filters]) -> string:wavencode
#encode(number:frequency, number:duration [, function:filters]) -> string:wavencode

Repeats the sine samples to fulfill a specified duration and encodes them to a WAV format.

#play(number:frequency, number:duration, [function:filters] [, function:callback ])
#play(number:frequency, number:duration [, function:filters] [, function:callback ])

Generates and encodes a sine wave and tries to `play` it with the `<audio>` element. Also, binds a callback function to the `onended` event of the `<audio>` element.