I've used an Ernie Ball Jr. for awhile. I believe I have the lower impedence one with an active bass. I haven't really looked at the pedal in awhile, and can't remember which one I got.
I used to have the other version, but it broke (gasp.) I'm kind of glad it did, because even at full toe-up I have soundcomming through. The problem was solved when I got this one. I wish I could help a little more with the version, but just can't remember.
I'm still a little wary of the little string. When the pedal broke, the clasp, or whatever it is, came undone on one end. My guitar player had one at the same time, and about two weeks before mine went his string actually broke.
They do sell repair kits for them, so they can be fixed. However I would rather give my bass to a guitarist and shove my head ito one of the ports on my cab than try and actually use the kit. I don't know who they have making them originally, but they must be part-timers from the Wonka factory. Even with tools I had no way of getting anything into the pedal to manipulate any of the parts.
All that aside, I do like my Ernie Ball Jr.