Roxsyn -- a synth that rocks. Photo: Charlie Sorrel/Cult of Mac Roxsyn is the “world’s first metamorphic guitar synthesizer” for iPad. The app lets you plug in your guitar and, when you play it, ...

Every once in a while, a single instrument arrives and rewrites the rules. Not just for music, but for culture itself. Think about it. A strip of brass and a few keys gave birth to jazz. A solid block ...