I've asked GML about the mod in db this was the reply :
We don't offer any gain modifications or production variations for the 8200; however, nearly anything is possible. A mod of this sort would entail sourcing a highly customized control in addition to a gain-set buildout. The rework itself could be relatively trivial and the calculation of values fairly straightforward, but the headache and cost is in the control. For reference: in production quantities, the existing control costs $50.
That being said, the production control could also be "slugged" -- but this will significantly (and non-linearly) alter the cut/boost taper. That would completely change the "feel" and function of this control ... not something we would recommend, but it might be acceptable for a specific installation / application.
Best regards,
Jeff
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Jeffrey Warren
GML, LLC.
Nashville, TN USA
George Massenburg Labs