Hmm, I'll give that honour to the guitar most likely used on EVOL...
The mixer is very interesting though, is this what they were using to amplify things like Kim's toy beatbox ("Tokyo Eye"), Thurston weird keyboard ("Swimsuit Issue", much tween-song beat noise), the TV always playing during the Goo tour (did they take this on tour with them? I've always meant to ask, or maybe I already have...they seem to resort to channel surfing at many Goo era shows)? What would the 8-track be for? (Or is not implied that was used live?)