Using new FreqCal function, Sound card accuracy?

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Using new FreqCal function, Sound card accuracy?

So I've been playing with the new Freqcal function that is built into the new WSJT-X v1.8.0 and it's supposed to tell you your frequency calibration, but it not only requires that the station standard be accurate, but ALSO that the 1500 Hz sound calibration be accurate also. (Set to 16 bit, 48000 Hz as recommended.)

Is there a way that I can correctly measure the frequency accuracy with the computer sound card, or is the calibration procedure simply relying on the DIFFERENCES between all of the different stations that are being measure, for the slope and intercept, and not the actual frequency accuracy?

Mike, W0IH