I don't have a better example of this because i don't make much of that kind of hard electro sound , but i made this piss-take monstrosity (shhh) for the competition
Soundcloud
and it has those sort of growly sounds
I synthed the growl in FM8 by using 4 operators with varied envelopes , mostly a sine modulated by a triangle and another waveform i don't remember its name
The trick would be to have different envelopes on each modulating operator
The pitch bend is also important
I applied multiband distortion with D16 Devastor, followed by compression and EQ and finally a limiter to level it off
resample that, and placed it in my sequencer
The advantage in this case was i could figure out my FX chain, synth the growl, and place it in the sequence as a sound that is set in stone. Then i went back to FM8 and tweaked the patch, made a similar but varied growl, and rinsed it through the same FX chain and into the sequence
You can sit there making growl after growl, changing shit up, altering the distortion, and you don't have to open up another synth or FX chain. If you don't like any of em, throw them in the trash or save a bunch for later projects. Now you have your own unique folder full of fithy growl basses ready to use in multiple keys
Also, i had one operator muted during the growls that used a single sine bass wave straight out of the synth's output. After each growl, I would mute all the other Ops, un-mute the sine wave, bypass all the effects and run the MIDI note again, sampling the sine to a mono audio track.
Now each of my growls has a fat sub bass layer that has the same pitch, duration, and pitch envelope. the pitch envelopes are the main reason for doing this
so that the sub is in tune with the growl.
And that's why i would definitely resample. Some people would take all those womps and wobbles and growls and shit and put them all on pads/notes of a sampler, assign a choke group (so only one bass will sound at a time) and go nuts playing the sampler to create a new bassline
that's a method you can NOT use with synths
you might discover a sick bassline pattern using sounds from 3 different synths or patches.