#2
It sounds like artificial harmonic. Octave effects sounds more like chorus such as Eventide Harmonizers.
No man is your friend, no man is your enemy, but every man is your teacher.

When he asked for John Myung, John Myung said:"Who the hell is John Myung?"

Proud User of Ibanez, Korg, Rocktron, ENGL
#4
Listen to the song and pluck the note normally and see if the note you plucked and the harmonic is the same. After trial and error you should be able to located it.
No man is your friend, no man is your enemy, but every man is your teacher.

When he asked for John Myung, John Myung said:"Who the hell is John Myung?"

Proud User of Ibanez, Korg, Rocktron, ENGL