via
this auction
"Here is a an Electro Harmonix Big Box. This older version of the pedal has become a desired for its classic folded body, self adjustable pot accessible on bottom, and reported longer sustain than its newer counterpart. This particular version also lends itself to extraordinary mods, that can be seen throughout the Web.
When I got this pedal a time back, I could never get it play like I wanted. After reading online blogs and posts, I found that there is a reported learning curve that accompanies this pedal. It is analog monophonic, and requires a proper technique and style of play. I personally could never adjust to it, and could not determine if it was just my inability, or faulty pedal. Not having access to another pedal to compare it to, I contacted Electro Harmonix to see if they could check it out for me. They were very cooperative, and gave me an address and instructions of were to send it to to have it inspected. They said they would charge a flat fee of $25 and for that amount , test and recalibrate the unit to factory specs. This would include the service and return shipping!
I thought this sounded like a great deal. I became occupied with other projects and never got around to it, and am now selling it.
This being said, the pedal is in great cosmetic condition with minor wear(see photos) Because I can not guarentee that the pedal is playing at 100%, It is being sold AS IS., and at a lower than general price. As mentioned above, If you found that the pedal is not playing as intended, ElectroHarmonix will test and recalibrate the unit to factory specs, for $25.00."
Regarding the custom Emu: 
