Interesting. How will the OPA2134 affect the tone? I could give a crap abut "vintage" because I'm not trying to sound like SRV. And I agree with you, about new electronics, technology is supposed to improve over time - not get worse, unless you get into the really cheap stuff. I think there are pros and cons to just about everything.
How difficult would it be to install one of those chips? I've soldered before, but does it pop right in, or would I have to get one of those thinga-ma-bobs that you mentioned earlier for quick chip mods.
According to Musicians Friend, it says it has the JRC4558D chip and the knob adds more low end crunch. Maybe I'll mess with that switch some more, they say bringing it to setting one, makes it sound more like a TS9.