I remember Access added some sort of "Moog" filter types in OS 6.5, but no comb filter. From what I recall, the "Moog" fliters are bit more dirty than standard 4 pole. I've hardly ever used them. I've never really attempted myself, but a combination of effects and the two filters, you might be able to come up with something. Virus C is loaded with options. As for patching audio out through a VST, you can always do that, but it is not the same because the filter in a synth is post oscillators and pre amplifier.