Keep your stringed instruments at correct pitch with an app such as Super Tuner that takes advantage of your smartphone's portability, bringing the tuner to the guitar instead of the other way around. Use an onscreen emulation of a guitar neck to try out chords and audition strummed patterns. Run a realtime DJ mixing console such as Live Touch XJ that accepts tunes from your memory card or USB device and saves playlists. For the ultimate in eerily unmistakable instrumental additions, try out a smartphone theremin in an app such as Plasma Sound HD.
