iShred can turn your iPhone or iPod touch into a rock funfest. Frontier Design’s app can turn even the most musically-challenged newbie into an artiste. Included is an interface with effects such as Fuzz, Delay, Treble Boost, Vibrato and Tremelo, and has a recorder and starter songs. Altogether there are over 2,000 chords, fret positions and scales. iShred can be used with Frontier’s Guitar, an acoustic app, and can be found $4.99 at the App Store.