Other/unknown Glou-Glou Pralines - Pedal on ModularGrid
I've wanted a passive octave bandpass filter like the Brüel & Kjær 1613 for a while, but found it difficult to source - so I designed and built my own in 10hp! :
Low Pass High Pass filter | High pass, Electronic schematics, Diy guitar pedal
Digitech DOD Envelope Filter 440 Band Pass Filter Pedal
Death by Audio Evil Filter - Fuzz Filter – Thomann Norway