Map typed arrays to lists for now.

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

 library dart.dom.web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:_foreign_helper' show JS;
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:audio library.
@@ skipping 66 matching lines @@
   @DomName('AudioBuffer.numberOfChannels')
   @DocsEditable
   final int numberOfChannels;
 
   @DomName('AudioBuffer.sampleRate')
   @DocsEditable
   final num sampleRate;
 
   @DomName('AudioBuffer.getChannelData')
   @DocsEditable
-  Float32Array getChannelData(int channelIndex) native;
+  @Returns('Float32Array')
+  @Creates('Float32Array')
+  List<double> getChannelData(int channelIndex) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 
 typedef void AudioBufferCallback(AudioBuffer audioBuffer);
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ skipping 729 matching lines @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('WaveShaperNode')
 class WaveShaperNode extends AudioNode native "*WaveShaperNode" {
 
   @DomName('WaveShaperNode.curve')
   @DocsEditable
-  Float32Array curve;
+  @Returns('Float32Array')
+  @Creates('Float32Array')
+  List<double> curve;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable
 @DomName('WaveTable')
 class WaveTable native "*WaveTable" {
 }