yeah its all about the es1, nice expensive wide CLEAN sound, unlike some of the vsts out there where you end up spending half an hour trying to turn off the rubbish delay/chorus/arp/noise it loads up with (WHY DONT SYNTHS FIRE UP ON A NORMAL BLOODY WAVEFORM!)
also the new cubase has a similair clean soundin synth that comes with it if like me you have no time/money for elitist silver designer computers with one mouse button (i am not a seal!)
if ur on reason try sending the cv signal from a synth trough a splitter, then send one cv signal to filter cutoff and the inverted one somewhere else like distortion depth etc. also loads of flipped lfo's on various distortion parameters give a lot of character and movement to the mids on a bassline