Vulture Bytes has spent all week at a tech conference, which means that any mention of a start-up only drives us further into visions of a tech dystopia. But maybe these gadgets can save us all. This week: a piece of plastic that makes the iPad’s speaker louder, an Instapaper for video, a gadget that adjusts your guitar knobs, the easiest way to learn piano, and the new Nook.
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