Like most other Catalinbread pedals, the Pareidolia was designed for both 9v and 18v operation, the latter giving a more pronounced up-front sound to the effect. We worked very hard tuning this pedal, and the result is a complex modulation that is quite literally a mesmerizing effect, where you stop thinking and just start playing. It frees your mind to be creative. It is hypnotic, yet unlike over the top modulation effects the Pareidolia doesn't pwn your sound, allowing your playing to shine through. And unlike other modulation pedals it is less picky in its placement with other pedals. Whether the Pareidolia is placed pre-dirt, post-dirt, or sandwiched between, this pedal still sounds great.