From a beginners POV just wondering if there is a difference is sound quality (I.e. depth, timbre, resonance) between VCO modules? I gather they all sweep through the audible frequency range in some form or other, but is there a definable quality that makes one more pleasing than another? I am thinking about picking up a Lifeforms module to start my synth module journey and wondering if the VCOs in the unit are any better or worse than others. Cheers.