I'd like to know what is that sound and how do you achieve that sound at :18
Sounds like pluck guitars or some pluckish sound
I've heard it a couple times in some of his videos
it's a guitar with chorus with a quick arpeggio across several strings (i.e. a chord is strummed so that we can hear each note quickly in sequence) then some short decorative melodic runs before the next chord and so on
best way to do this: hire a guitarist as this is played by a real person not some concocted MIDI performance (I could probably pull off some of this via MIDI but there are bits that are not possible in a midi performance)