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but when subsequently trying to verify the calibration, selecting and deselecting C weighting MADE NO DIFFERENCE
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You have to load the saved soundcard calibration file before it takes effect..
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BTW, I made Dell D520 Mic input useful by putting an 8uF non-polarized cap
in series with an 82K resistor, with a 10K resistor to ground at the other end.
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Although you can make laptop microphone inputs work by blocking the DC and dividing the signal lower, usually they're not too suitable for line level signals since their gain is quite high which results in an extremely poor noise ratio. Many of these inputs also suffer a limited frequency response since they are designed for microphone voice bandwidth.. The external USB cards offer really good results with limited expense.
brucek