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You make it sound like that those who use a tension gauge don't know what they are doing
I'm sorry you misread my comments in that way. I was talking about a hypothetical situation in which we start from a place where there are no pre-existing tension measuring tools; in that case, the most economic way to build an accurate and precise one would be to use the sunk investment most of us already have in a powerful portable computer with a built in microphone (that's a mobile phone). Obviously the existing deflection based tools are plenty accurate and precise enough for most wheel building projects.
gbj_tester
A microphone + frequency analsyer would be good but it also is so much work for so little gain. First the crossing points of the spokes may effect frequency at a given tension, testing would be required to figure that out. Then if this is the case, ERD difference and flange PCD difference will change were those crossing points are. Easton build wheels which are consistant in that regard so they do not have to worry about such effects if they are even important.
So given the work involved get this to work and the fact it may not work any better than DT Swiss Tensio for example I will stick with the tried and tested method. You make it sound like that those who use a tension gauge don't know what they are doing, We do we just do it differently to you! Oh it's not crude either. I have created a spoke tension calibration jig and you what, the deflection readings I get are consistant. I also happen to know what they should be rather than what the chart says (which actually is correct for the DT guage). Some gauges like the Sapim or Park tools TM-1 are not overly consistant. I have all three!