Reply to Long release low bassline.

I'm new to this but just working on creating a sound.

Happens right around 1:00 in avicii's levels. Also starts alot of songs off. I've been trying in massive which is the only synth I own outside of operator.

I'm sure there is a tutorial but if someone could link me or just talk me through the concept I would greatly appreciate it.

http://www.youtube.com/watch?v=kVk1HOlkq_o

Tried to search it but its kind of hard when you don't know what to call it.

Oh and its hard to hear on the shitty youtube version so the 320 for avicii's sound may be easier.