Heh...actually, my idea with all of those VCOs is to have them handy as either an audio or modulation source. All of them have that convenient VCO/LFO switch, which I wish we'd see more of as it's super-handy to be able to flip that and alter the oscillator function on the fly. Plus, given that the Gravitational Waves's oscillators can flip functions like that as well, you have the on the fly ability to completely alter the audio-range oscillator in one of those pairs by radically changing the FM rate. I like that; that functionality was one of the more convenient things about the ARP 2600's VCOs.