John Frusciante’s Line 6 FM4 Filter Modeleraccess_time First seen circa 2001
This pedal was first used by John probably sometime during the By The Way studio session, at least based on the fact that he was seen using it during the album tour.
One song from that album that almost certainly is recorded with this pedal is Throw Away Your Television. To see a demonstration of how this sound could be achieved, check out this video by Will Galluccio – Sound like John Frusciante – Ep. 4 – Line 6 FM4.