Currently works in Chrome through the 'webkitAudioContext' object.

Firefox only has their own useless nonstandard sound API thing that makes Flash look good.

• npm install -g coffee-script
• coffee --compile chrome-waveform.coffee

For local testing, remember to run Chrome locally with --allow-file-access-from-files.

• OSX: open /Applications/Google\ Chrome.app --args --allow-file-access-from-files

• See waveform.html

Waveform :: ({file, canvas, onStatus, onReady}) -> {
  playback :: { moveCursor :: (Num) -> () }
  view :: {
    play     :: -> ()
    playAt   :: (Num) -> ()
    getTime  :: -> Num
    pause    :: -> ()
    isPaused :: -> Bool
  }
}