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Condition: Used
The 4 knob DRD is a product of the original way Bjorn made the BJFe DRD. It was 3 knobs but it also had the lowmids control attached to the drive knob in reverse - so you got a beefier clean/low dirt sound and it tightened up for higher dirt settings. The new M control does all of this but also lets you use it in other ways to push the DRD into fuzzier territory or use it as an EQ for cleaner tones - a little mids can go a long way.