The 1978 IC Big Fluff Pie V4-5 is a guitar effects pedal based on the Op Amp Big Muff Pi. It is known for its thick and meaty fuzz tone, making it a must-have for any guitarist. This particular circuit is the V4-5, which is a variation of the V4 with the addition of a tone bypass switch. The V5 version can also be made by following the same circuit.In the 1970s, there was an experiment to recreate the Big Fluff Pie tone using op-amps instead of transistors, and this pedal is the result of that experiment. While it didn’t perfectly replicate the original tone, it developed its own unique and sought-after sound. It falls into the same territory as the Big Muff Pi, but with a heavier and grungier tone.If you want to hear the characteristic sound of this pedal, listen to the Smashing Pumpkins’ album ‘Siamese Dream.’ The pedal’s sound can be heard throughout the album.The circuit board includes pads for modifications suggested by AnalogGuru, which can make the pedal slightly crunchier. However, the pedal sounds great in its stock form, so it is recommended not to make any modifications unless you know what you’re doing.If you’re interested in learning more about the Big Fluff Pie and its variations, you can visit Kit Rae’s Page for a comprehensive read on the subject.The pedal is housed in a 1590B enclosure, which is relatively slim compared to other enclosures. Despite its size, it still delivers a fat and powerful fuzz tone.The optional tone-bypass switch is board-mounted, which means it requires minimal wiring and is easy to mount in the enclosure. This makes it convenient for those who want to add this feature to their pedal.

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