The Homebrew Electronics Psilocybe is a phaser. A phaser is an electronic sound processor used to filter a signal by creating a series of peaks and troughs in the frequency spectrum. The position of the peaks and troughs is typically modulated so that they vary over time, creating a sweeping effect. You can see the Psilocybe in the picture which I included. This is a photo of one of Brad's pedalboards when he was still with Third Day. You can have a better look at this pedalboard
here. The Psilocybe is the pedal on the left, bottom row.
You can have a closer look at this effect pedal
here.
