I want to share with you these my settings to get a similar Frusciante's sound used for the song under the bridge.This is one of my favorite RHCP'S song because john uses the style of the great jimi hendrix.
I use clean channel with my stratocaster in neck position .The settings from 0 to 10 are:
Presence 3
Resonance 8
Reverb 4
Volume 2
Treble 3
Middle 8
Bass 6
Between the guitar and amp also use a Boss CS-3 compressor .
Good music greetings