The following Dart code:

import('dart:dom');

main() {

  var audioContext = new AudioContext();

  var source = audioContext.createBufferSource();
  source.connect(audioContext.destination);

  var xhr = new XMLHttpRequest();
  xhr.open("GET", "techno.mp3", true);
  xhr.responseType = "arraybuffer";
  xhr.addEventListener('load', () {
      var buffer = audioContext.createBuffer(xhr.response, false);
      source.buffer = buffer;
      source.noteOn(0);
  });
  xhr.send();

}

(which works fine in JavaScript) does not work in Dartium

Error:

Exception: NotImplementedException
Stack Trace: 0. Function: 'AudioContextImplementation._bind@1c3f8015' url: '/b/build/slave/dartium-mac-inc/build/src/xcodebuild/DerivedSources/Release/webkit/bindings/AudioContextImplementation.dart' line:61 col:3
 1. Function: 'AudioContextImplementation.AudioContextImplementation.' url: '/b/build/slave/dartium-mac-inc/build/src/xcodebuild/DerivedSources/Release/webkit/bindings/AudioContextImplementation.dart' line:57 col:15
 2. Function: '::main' url: 'http://localhost:8000/app.dart' line:5 col:20

Dartium version: 18.0.1023.0 (Developer Build 119649 Mac OS X)

See attachments for HTML and MP3

Attachments:
techno.mp3 (362.45 KB)
app.dart (448 Bytes)
index.html (325 Bytes)