From heavy metal to pop, the guitar synthesizer is one of the most commonly used additions for any guitar player. It’s what gives rock songs that piercing distortion and the woeful tones to the blues.

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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, ...

Which guitar synthesizer is best? Since the introduction of the electric guitar, synthesizer pedals have used filters, oscillators and envelopes to embellish their sound with a transformative palette ...