MOD KITS DIY - "The Ring Resonator" DIY Pedal Kit The Ring Resonator kit is an octave up fuzz effect An all analog design that captures those late 60s octave up fuzz tones Transformer coupled germanium diodes produce sounds that range from a subtle octave up to thick, harmonically rich sonic textures and synth-like tones. Experimenting with different pickups and tone control settings on your guitar with the Ring Resonator can also produce sitar-like sounds. MOD Kits are designed to give novice and experienced musicians the opportunity to build their own amps and effects pedals.