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Building a single channel variable U-Pad

I read up on pads of various kinds, and I want to design a single channel variable pad for use between a microphone and the preamp when recording drums. The preamp in question is the channel preamp of the RME Fireface 800, which has an input impedance of 2k. Here is what I want to do. I will build an external enclosure with XLR in and out mounted to it.