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In Firefox you can right click it and change the play speed. It only allows you to change to 0.5x, 1.5x and 2x but if you want some other speed you can simply open the console and do `document.querySelector('audio').playbackRate = 1.3`

Or Soundcloud, https://soundcloud.com/nodeup/84-iojs-update-1

I didn't realize anyone actually did this, but now that you've said it I noticed stitcher has this as an option too.