That control knob layout (two single, two stacked) works well with the Audere Pro Z or Classic 4-band preamps. The Pro Z would need one extra small hole for the impedance switch but the Classic would work without modification.
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http://www.audereaudio.com/Classic2.htm
I installed the Pro Z in an SR1000 and it sounds fantastic. It's almost has too much flexibility so it's for those who like to 'tweak their tone' a lot. I recommend shielding the pickup and control cavities though as the Audere reaveals everything, even noise.
Jeff
Cool
