Established British audio accessory developer Focusrite has debuted iTrack Solo ($200), a dual-input audio interface for recording and mixing directly to an iPad. Similar to the company’s Scarlett 2i2 for computer use, iTrack Solo features a professional-grade microphone preamp with low distortion and noise, plus phantom power, promising “pristine quality” for guitar and microphone recording. GarageBand and other apps are compatible…