Yeah, it's just palm muting.
Quote by MightyAl
I took a pic of myself, cut a hole in the face and stuck my knob through so i could see what I'd look like if I got bitten by a radioactive elephant.
ah the echo song.... i love element 80. i got the chance to see them live, they rocked. anyways yes, just pedal the root while palm muted and let off the mute when you hit the 5th.
The key is in the delay. He's playing straight eighth notes. The delay is set to one repeat, at dotted eighth notes. This puts a repeat of one note in between the next two-- if he played 1 2 3 4, you'd hear 1 21324. Other then that, just palm mute a bit. I have the tab if you need it.