Chrome implements the reduction attribute for a DynamicsCompressorNode as an AudioParam. The WebAudio spec says it should be a readonly float. Change Chrome to implement the specification.
Docs: http://webaudio.github.io/web-audio-api/#widl-DynamicsCompressorNode-reduction https://developer.mozilla.org/en-US/docs/Web/API/DynamicsCompressorNode https://developer.mozilla.org/en-US/docs/Web/API/DynamicsCompressorNode/reduction
Samples: https://github.com/GoogleChrome/web-audio-samples/wiki/DynamicsCompressor.reduction