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The percussive notes represent thumb slaps on the 6th string with enough force to slap the string against the frets. The four percussive notes in measures 67-68 alternate between a thumb golpe to the bass side of the soundboard and a thumb slap on the 6th string. The last note is performed Pizzicato Bartok (plucking the 6th string away and popping it against the fretboard).
Measures 10-12 are extremely hairy at tempo and can be omitted if necessary.
All of the artificial harmonics are played on open strings at the XIX fret. PTA MIDI doesn't allow these to ring as they should be played.
This arrangement by Victor Villadangos has not been published, but he was very cool and shared it with me. I have made minor changes to better reflect the recorded version.