Add swing to the playback

[dranidis]

The swing is added as a parameter in synth options:

synth: {
  el: "#audio",
  options: {
    displayRestart: true, displayPlay: true, displayProgress: true,
    options: {"swing":66}
  }

The swing is represented as a percentage of the duration of the first note to the duration of the pair of eighth notes.
The default is 50%, which is no swing.

Try out editor-swing.html in the examples folder.

[paulrosen]

Wow! This looks great and something I've wanted for a while. I will have to study it a little bit to see how it acts in some edge cases.

[paulrosen]

Thanks for the example! That saves me time.

[dranidis]

Thanks for the example! That saves me time.

Let me know if you need something changed.

By the way, congrats on the library. Great work!