I recently found a sample of a long saw bass note in the Leviathan sample pack and by cutting it up I got that cool older electro sound.  I'll try to find it for you later.  But, I think that working with audio, as opposed to MIDI, in this situation works well Maybe with some LPF automation. 

Try opening up a synth that you like and beefing up a low pitched saw wave and bounce it to audio, then manipulate it from there