 All double locking bridges have been the original Edge tremolo, not the newer models, which point to a more custom guitar than the "off the shelf" models.Satriani played a red 7-string JS model, seen in the "G3 Live in Tokyo" DVD from 2005.He also has a prototype 24-fret version of the JS—now called the JS-2400—which he has used with Chickenfoot.