WebKit2.Settings.enable_webaudio

Settings.enable_webaudio: Boolean (Read / Write / Construct)
  

Enable or disable support for WebAudio on pages. WebAudio is an experimental proposal for allowing web pages to generate Audio WAVE data from JavaScript. The standard is currently a work-in-progress by the W3C Audio Working Group.

See also https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html