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a great little pedal loaded with a huge sound features: tone vol and sustain (gain) knobs plus a switch to bypass the tone stack and get a really gnarly sound quality: built like all EHX pedals, super stout switch feels nice sound: big and dirty. this pedal sounds beefier than my tone wicker big muff pi. the sound is dirty and kind of noisy but it responds to your playing. ease of use: only 3 knobs and a single switch, if you feel like you need more knobs to fiddle with try the JHS pumpkin patch modded pedal value:this pedal is pretty cheap but sounds great and is built like a tank the wow factor: yeah its there, it did what i expected out of the box, just cranked the sustain and went to town

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This pedal is a reissue of the Big Muff used by Billy Corgan on the fuzz drenched beast that was 'Siamese Dream'.This is an awesome fuzz that can absolutely roar. I find it much more responsive tone-wise with the toggle switch tone control turned on.It can be really bright so I keep the sustain (amount of fuzz) pretty high, between 1 & 4 o'clock with the tone around noon.I ran it through my Marshall Origin 20 head using two 4×12's and the sound was HUGE.I also have the Ram's Head Big Muff and generally the two are fairly similar but I personally prefer the Ram's Head with single coils - using my Fender Hendrix Monetrey Strat, and the Op Amp Muff with humbuckers; a Jackson loaded with the Duncan Hot Rod set.I find both pedals make the guitar tone control a bit ineffective - I turn it to 0 and let the pedal and amp do the work.If pushed, I'd choose the Op Amp over the Ram's Head.I sorta wonder how my EHX SYNTH 9 would sound through one of these. Hmmm...(When I started playing, 1979, EHX had a reputation for great sound but inconsistent quality. Those days are over. I have several EHX pedals and they're all top notch with no issues.)

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I own an original 78 op amp, so I jumped at the chance to add this to the board, as I don't like lugging around my vintage muffs. It doesn't nail my 78 dead on, but whose to say my original sounds like it should? All in all, it comes close enough to the Siamese fuzz we know and love, takes up 1/3 the real estate of the original, features true bypass (the original does not), and costs half of what a boutique pedal does these days. Easy to use and dial in those thick tones. It seems to lack the low grit growl when you dial back the sustain, but I have another fuzz for that.

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