Not to make this even more confusing, but.......
Keep in mind that "choked" or "baritone" sound refers to that nasal, devoid-of-bass tone that the EB-2s/Rivolis made famous. Same goes for the EB-3 - the filtering portion of the circuit is basically identical.
On the series-1 EB-3s, I've seen position one on the varitone referenced to as "tone choked", and that is a bit of a misnomer becuase it in fact
isn't the choked sound. The choked/baritone sound of the mudbucker comes in on positions three and four. Position one is supposed to be unchoked wide-open sound of the neck pickup, but it is plagued by
the same residual filtering effect that the EB-2s suffer from. The filter remains in the circuit, and in this mode has the side effect of rolling off the high frequencies - creating that thunderous low-hovering-cloud bass tone that lacks high frequency definition. The circuit is
here for reference, and I'm assuming that the left-most throw on the switch as drawn is position one (since it wasn't labeled).
Uwe brought the EB-2 residual filtering issue to everyone's attention back at the 'pit. Prior to that, I always just assumed that absurd bottom-dwelling boooooommmmmm was in fact the "real" sound of the mudbucker. What a surprise to hear what was actually hiding in there! I've also heard folks say they prefer the sound of the EB-0 over the EB-3. I'm thinking that the reason for this is the fact that the EB-0
does not have any of this choke/residual-filtering business going on. It inherently has the full-range sound as a result - which you can't get on an EB-3 without rewiring it.
...and just to clarify a bit further: what I mean by "full-range" is the sound of that neck pickup without the nasal choked sound, and without the residual lowpass filtering effect of position one rolling off the high frequencies. The full-range sound retains the bass that will level buildings, as Bob put it, but it also contains the upper mids and highs needed to give some bite to the sound.
I rewired my '66 EB-2D to get into the unfiltered mudbucker sound. I later got a '69 EB-3, and since I tend to run position three a lot on that bass, I just left well enough alone. I then bought a '69 EB-0, and I use that for the unfiltered mud sound. In fact, I did some fun wiring mods on that one and made some soundclips so you might be able to hear what an EB-0 sounds like in comparison to your own EB-3. The clips are in
this post.
If you made it to this point - I hope that helped!(?)
Gibson really had some eccentric wiring goin' on in their old basses, eh?