I'm hearing two basses.

The 808 drum hit sounds a bit saturated / distorted / overdriven and EQ'd, just try playing around with a high quality 808 sample that has the same decay setting.

The second bass sounds a little higher up in note, which can be easily made on any synth - Sine Wave. Then again just saturate it or use tube distortion to achieve the same sound.

Once these are made, just side chain to the kick drums to taste. 

Don't worry about getting it exactly right, just keep messing around with saturation, tube distortion, overdrive. Careful not to overdo it, as your sub will get lost in the distortion.

I heard Carnage knows thing or two about 808s.
https://www.youtube.com/watch?v=-IPxxeb-4gk
(...sry, couldn't resist.  )

i am so cool, i learned how to do this before he learned how to say to do this...

I'm hearing two basses.

The 808 drum hit sounds a bit saturated / distorted / overdriven and EQ'd, just try playing around with a high quality 808 sample that has the same decay setting.

The second bass sounds a little higher up in note, which can be easily made on any synth - Sine Wave. Then again just saturate it or use tube distortion to achieve the same sound.

Once these are made, just side chain to the kick drums to taste. 

Don't worry about getting it exactly right, just keep messing around with saturation, tube distortion, overdrive. Careful not to overdo it, as your sub will get lost in the distortion.

alright thanks! okay ill mess around with that

I heard Carnage knows thing or two about 808s.
https://www.youtube.com/watch?v=-IPxxeb-4gk
(...sry, couldn't resist.  )

lol