Many of the issues we run into when recording guitars can be avoided by careful setup and proper room treatment. However, due to cost and time constraints, recordings are often made under less-than-ideal conditions—which can result in great guitar sounds affected by background noise, amp buzz, clipping, and other distractions. Fortunately, with iZotope’s RX audio repair software, these issues can be fixed effectively and quickly, so you don't have to throw out an otherwise perfect performance.
Check out the tutorial Reducing Hum and Buzz from a Guitar Track.
Check out the tutorial Reducing Pick Noise and Attack from a Guitar Track.