VariRec is a new tool sported by the PX-4012TA, which allows users to adjust laser power settings when burning CDs (note: VariRec will only function at 4x). Jitter is to some audiophiles a huge problem, for jitter affects the quality of sound on CD by having deeper or longer pits than the original copy. Plextor's solution is to let the user adjust the laser power settings on a small margin in order to make a more accurate sounding copy of their music.