I've been working in the workshop translation, and "Error Banded" (if I'm not mistaken) is only a style of grading (in workshop module!!). You can set up lots of yes/no expectations for an assigment: "yes" if the element is there (so a credit would be given) or "no" if the element doesn't appear in your assignment (so any credit wolud be given for that part of the assignment).
The number of errors is the proporcional sum of the items that aren't in the assignemet.
You can also have a look at Moodle teacher's manual (contributed by Matt Riordan), and you'll find exemples of this style of grading.
Hope I've been useful!!