I think the best description of the differences between the MKIII & MKIV tonebender comes from non-other than the captain:
The origins. Tone Bender MKIII, Tone Bender MKIV. Same party different
frock. Aside from the obvious differences in the enclosure type of these
pedals any true solid definition of which is what in regards to circuit
type is and will always be a little bit of an ambiguous subject. The
way I always made sense of it in my head was in regards to the biasing.
The early MKIII’s were choppy, heavy, clumsy, a fuzzy lump hammer. The
later MKIV’s were smooth, dynamic, articulate, a distorted boxing glove.
In between, you have a foggy transitional period. Even with the those
definitions in place it never always runs true.
Couldn’t find a video of an original, so I figure the best example of the pedal is going to be the DAM version. Want to be clear, this layout is for an original Tonebender MKIV not the DAM one as travis pointed out.
