This is why I like the Eloquencer and Queen of Pentacles combo. You get a killer sequencer, drum voices, filter, and effects in two modules leaving room for utilities like a good mixer and VCAs and envelopes. For an attenuator, the WMD 4tten is great with sliders to help adjust levels for the various drum voices. But you could just buy an Erica Synths Techno System and be done with it.
That is what I would do if I had the cash and wanted a well sorted modular techno machine.