Background Growl in 'Braindead' Zomboy

[Alan Adobe]

So i am working on a drop, and i have the synths that i want to use and i tihink they sound good, but something is missing, there is this kind of background sound that i hear and i dont know what it is exactly or what they are doing to accomplish it. i have a sub bass under my High Pitch Hits (scream bass), but if you listen to the scream bass on this song, there is this extra sound there, anyone know where i can get some information on what he is doing, or does anyone know what hes doing, and have other examples?

1:02

http://www.youtube.com/watch?v=1bOy9m_OBTE

Thanks. also if anyone knows how to make some of those scream basses that would cool too man.

[mthrfnk]

Parallel distortion/birtcrushing and a shit ton of white noise.

[SkuxxOfficial]

Some tips when making a drop:

Have a background arp.
Have a vocal, "heur", "yo" skanking.
Use loads of crashes.