I asked the two questions because first of all this is a technique that's used for long time called pre distortion. Basically you calibrate your system to have low distortion, any measured distortion will be external. But it drifts in the same environment after 10, 30 minutes. It's useful for some cases but has its limit. That's why I asked how you solved this, I assume you know that.JohnYang1997, why I should care about your thermal environment? You may perform distortions measurement any time you wish, cold either hot whatever, next save the preset with 2nd/3rd harmonics correction and name it "calibration at +35C" or "calibration at -10C"
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Second question is simply that you had two pictures with two different tones at op. And didn't specify in any post this "only" works at 1khz(which will be basically useless if that's the case). And it's "trivial" to creat presets for different frequencies I assume.
Also I don't know if you have any mechanism to monitor distortion on the fly and correct it on the fly.
Sorry, but if you think this is crazist shit ever you are out of your mind...