references

    How does your guitar osccilospoed signal looks like?

    All Harmnics come from: pickup internal jiggle (magnet-coil), mounting, neck, pegs, body all that can vibrate or move They are all added up to the string vibration contrinbuting to final output

    You can record with audacity See here the free vibration of high E then expand the waveform, then adjust the percentage of harmonics until you get a closer signal to what you have. That is how much the things out of the coil (coil to magnet jiggle, pickup relative to body vibrations, pegs, neck and everyting that can vibrate) influences the sound.
    THE STRING ITSELF BASIC FREQ
    		 High E
    Harmonics from guitar body First harmonic: Phase -180°..180°:

    0
    Second harmonic