Three Pedals for the Shredder-kings under the sky,
Seven for the Metal-lords in their halls of stone,
Nine for Power Groups doomed to die...
Excerpt from Lord of the Pedal Board...
In 1977 Boss entered the world of compact guitar effects pedals with the release of three pedals - the OD-1 Overdrive, the PH-1 Phaser, and the SP-1 Spectrum. In honor of the 40th anniversary of their release, Boss produced a limited run anniversary set of 1500 units with reproductions of all three of these pedals. They had to make a few changes to the circuit and some component substitutions, of course, but the final circuit adjustments were all still performed by hand on the new production units just as they were with the originals. The SP-1 was essentially a parametric equalizer pedal that could really create some unique sounds if fed into a boost pedal. With original copies costing anywhere from $500-$800 - and the limited reissues at nearly the same price point, this would seem to be an ideal candidate for DIY clones.