A processor switch for the Gameboy DMG designed by Alley Beach.

The HLF_CLK (Half Clock) kit is designed to change the frequency at which the CPU processes down to half of its original speed, which when using a music program such as LSDJ, will drop a note down an octave. This is a valuable feature for those who like to have "filthy, crunchy, and raw" sounds for hard bone crushing drops. The tutorial is here.