Based on the same documentary on experiment music this time I used some objects (marker, pen, screw) above the string. I put the guitar horizontally
to interfere with the natural vibration of the 5th string. This caused all sort of interesting patterns. Some harmonic some not so much. Still, below, the fundamental note
remains. There are some presets with some strange subharmonics created by the bridge of the guitar (hitting the object). There are 15 different samples. Here is an example
with three of them:

Contributors

carlosrgz

U put the guitar horizontally and placed some objects over the 5th strings. By playing the string the fundamental note was below all sort of noise and interference