HiFi Mod:Upgrades stock value components for reduced noise and clearer tone.
Fullness Mod: Adds a toggle switch to bring more fullness to the tone.
MIJ Mods:If your pedal was made in Japan (MIJ,) it likely required a 12v aka ACU power supply to operate at proper efficiency. Some MIJ pedals might still work on 9v, but don't sound as good as they're supposed to.
ACA 2 PSA: Converts the 12v ACA requirement to a standard 9v PSA requirement.