He was involved in the making and promotion of this reissue pedal (the orange color is probably a reference to Smashing Pumpkins) with Electro Harmonix. He used his Op Amp Big Muff to get the Siamese Dream sound, so a standard Big Muff won't quite get the same sound. It'll get you close, but the Op Amp version is the one you want if you're trying to get the same gear he used. This video shows him using the pedal & talking about it.more
For about 9 years i've had a Little Big Muff which I've loved. When i started seeing videos that EH was reissuing the op-amp Big Muff, famously used by Billy Corgan and James Iha on Smashing Pumpkins Siamese Dream album, i was intrigued. I listened to some clips, and loved the sound of it. I made it known that it was something i would like and my wife got it for me. Actually playing it i have to say, it blows my Little Big Muff out of the water. It's a tremendous sounding Big Muff pedal. To my ears the Op-Amp sounds a bit brighter, and has a bit more clarity while still giving that Big Muff wall of sound. Not necessarily ideal for drone metal, but otherwise, it's a tremendous pedal.
I've been using the gen 8 muff for awhile, but the new op amp reisuue really hits the mark I needed in the studio. The tone knob has many layers you can create if you're into stacking fuzz guitars.
Cannot recommend this enough if you love the sound of early Smashing Pumpkins this is the go to. Huge rich fuzz tones that make me giddy every time I hear them. Whenever I plug in and play this pedal it makes me want to create music and gives me that feeling I had when I first started to play guitar. DO YOURSELF A FAVOR GET THIS PEDAL!