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How did you wire your volume pot? one end and middle needs to be connected together (to your purple wire in your diagram) and the other end needs to be grounded, according to Shades diagram.
It could be that Shades wiring doesn't work? I've not tried it. The volume circuit is somewhat unusual in that it simply reduces impedance.
It is easy to check whether your volume should work - if you get a piece of wire and connect between your purple wire and ground, it is as if you've turned volume put all the way down. If that works, replace that wire with a small value resistor, say 27k. It should be as if you've turned the volume to half way.
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