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Summing bus schematics. Anyone try?

Sorry to bring up this summing stuff again.

I'm curious. Has anyone attempted to build their own summing bus? The ones on the market (Dangerous 2b, Manley, Folcrum) are pricey. If you can build one for a $30 bucks why not try it. Below are some links for DIY summing mixers. I can solder a cable but Idon't know squat about building a circuit.