Searching for the perfect fuzz, Garrett finally developed his own pedal, the D-67, in 2006. He built 50 of them, giving about 20 to friends and other players he respected. The rest were sold through Primitive Sound in Burbank, California. Since then, the D-67 has become legendary and highly popular in surf and garage circles. The D-67's circuit is based on that of the Mosrite Fuzzrite®, but what made it special was that Garrett included a variable MASS control designed to counteract the tendency of fuzz to become washed out and unclear on stage. This was the starting point for the US side of SurfyFuzz. As development progressed, Bjorn added the HARMONICS feature and made further tweaks to the circuit to distance it even further from being a D-67 or Fuzzrite® copy. To further increase SurfyFuzz's versatility, Garrett suggested incorporating a switch that would introduce a different fuzz sound similar to late 60's Japanese octave style fuzzes such as the AceTone Fuzz Master. As with the US side, it is not based on any particular vintage fuzz but rather takes inspiration from classic Japanese fuzz sounds.