#2
id say in the same way you play pinch harmonics usually
just turn up the gain and treble, and try to find a sweet spot with your picking hand
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#3
Yea, You do pinch harmonics the same way everywhere, but try them in different places along the fretboard ( with your right hand as in more near the bridge pu or more near the neck pu)
#4
It's really almost all about right hand positioning and finding the sweet spot but a slight vibrato with the left hand makes them stand out too and gives less of a dry tone effect.