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If your bass has automation going on, should the subass have the same automation or doesnt it matter?

Also what key is subbass best played? thx

make it do whatever you want the sub bass to do, its your tune. There aren't rules to derpstep.

but IMO, if you have a brostep wobble wobbling at 1/16 notes, i like it when songs has the sub bass wobbling at 1/16 also, with my subs it makes eardrums rattle at 1/16 notes,

Cheers

also try wobbling the gain instead of/along with the cutoff, depending on what you're using for your sub, ie lfo on the cutoff of a pure sine sub won't do much.

try everything

go with what sounds the best

Either lop on a sub to the bottom end of your main bass, (ie in massive, just add a pure sine wave tuned down to the 30-80hz range)
Side chain to ze kick drum and process the whole thing all together

OR

Make a separate sub that follows the original bassline but isn't synthesized with the bassline itself. Leaves you more room to automate the volume, attack/decay, etc to get some movement in your sub. I also find that slightly detunning the sub via an envelope or lfo adds a bit of character :]

Oh, and the only "right key" for the sub, is the key of the rest of your tune. Just pop on a spectrum analyzer and make sure its somewhere in the aforementioned range (too much higher than 80, it'll start to muddle up with your kick drum, too much lower than 30 your probably not even going to "feel" it)

It depends whether you want to present the appearance of being moved by the midrange stuff or what have you. Sometimes you want it to seem like it's your wobble making all that bass, but of course as producers we know it makes more sense to use another generator (sine) so as to get pure, efficient bass. In that case, automate to match your wobble. But as was said above, use gain rather than a low pass. It's more predictable to work a volume knob than to try to calculate a low pass slope.

If you wanted to use the sub more for percussion, trying to tie it to your wobble might be counterproductive.