FS and for sale only (sorry I have way too many pedals),
Amptweaker Tight Drive Bass with the low end mod.
The pedal comes with its manual and is in very good condition, it's not 100% pristine but very close to it.
This pedal is the heaviest most overbuilt pedal I have come across. Tone ranges from light overdrive to fuzz.
Great youtube demo from Sean Frankhouser (the man is very funny too): http://www.youtube.com/watch?v=8RaWgjXHaa4
Dug Pinnick is also using this pedal.
$150 shipped CON US - PM for international shipping cost, as I mention, this pedal is not big but very heavy.
From the maker of this pedal, details on the low end mod:
"Due to many user requests, the Bass TightDrive is also available with an extra knob on the face that adds dry low-end back to the tone, making it easy to simulate professional dual amp rigs as used by artists like dUg Pinnick."