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Markbass LMII: an inside view :)

Here is the link to TB'r Vic's original post for showing how to change LMII jumpers along with actual photos of the amp's interior:

http://www.talkbass.com/forum/showpost.php?p=4363780&postcount=624

To answer your question, the DI jumper does NOT have 4 prongs! The jumper itself is a small, black removable clip that clips on to only TWO of the three prongs that are extending vertically out of the circuit board for the DI pre/post setting. It has no visible wires on it because the jumper wire is molded inside the clip. You'll see the words "pre" and post" in white letters right on the circuit board (they're also visible in the picture in Vic's post). This is where the DI jumper is located. The middle prong is always used. One prong is always unused, remaining exposed, just as in the picture.

Can I add..for the Effects loop mod, why cant Jumper #1 be put on a switch(mounted on the rear panel) and jumper #2 have a pot installed as a blend for the parallel effects. That way you could switch between the two settings and also have the option of blending the clean signal.

The same could be done for the DI jumper mod, just put it on a switch mounted on the rear panel allowing for both pre or post DI same as LM3. I will definately put a micro toggle on mine when it arrives for the the DI.