How do we know microphones on different devices are calibrated to record the same power readings? Do you have court-ready documents to show this?
I've searched but failed to find anything that works as a standard fiducial-type sound. e.g. With a recording of the sound produced by the fiducial from a set distance (and knowing temperature, pressure, humidity), you could calibrate/adjust recordings.
I've added a calibration feature, hoping it will improve and help.