“Adjustments at 100, 200, 400, 800, 1.6k, 3.2k, and 6.4k, for dialing any tone you want. The
graphic EQ of the Ibanez L series employs the same circuit as the GE-9
and just like its big sisters (the GE-9 and the GE-601), the GEL does
what it is supposed to do — be quiet and dial.”
More information on this effect can be found here.