"Careful With That Twang Bar..."

Looks hard at first...

"DigiTech and a Harman International company introduces the HarmonyManTM Intelligent Pitch Shifter guitar effect pedal. The HarmonyMan is the world's first guitar pedal that can produce multi-part guitar harmonies on guitar solos by analyzing the chords users were playing before the solo.

Players can simply perform favorite songs as they know them, and then hit the harmony footswitch at the start of a solo to render amazing multi-part guitar harmonies."

http://www.guitarjamdaily.com/index.php?option=com_content&task=view&id=1435&Itemid=73