Lun, the first plot you showed here, with values out to 2000 on the x-axis may work fine, and give you good audio, even though the plot is not smooth.?
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I presume your supply voltage was around 9V? (corresponds to about 2000 on the x axis).
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The reason is, as I have verified by experiment,? that all of the values across the plot need to be initialized to avoid distortion in the audio, up through your full supply voltage range.? When the calibration does not complete,? leaving part of the plot unpopulated, audio distortion results.
