Problems with your Fender’s fretboard? Is your vintage Moog synth sounding more like a Casiotone? For quality rehab and repair, follow the lead of techno pioneer Moby and head for Dr. Sound (25 Mercer Street; 334-5478), which handles both electronic and acoustic instruments. “It’s run by musicians,” Moby notes, “which gives it a great atmosphere.” Added bonus: Like Moby’s music, Dr. Sound is not only really good but also really fast. “Other places can take months to repair my keyboards; Dr. Sound can have them fixed the same day.”