could someone explain what's the difference between this type of synth and 3xosc or with vaz? too many terms for a newbie..by the way does anyone know any good free analogue emulator synths or probably demos?

An analog synth is one that relies on electrical mechanisms to produce a sound, whereas a digital synth would use mathematical formulas and such to produce a sound. An analog-emulating synth tries to use processes that simulate those that would be done with electrical currents and such, but still with math. I believe the 3xOsc is a subtractive synth, which is a type of digital synth.

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audioscrobbler / stephen's blog / audiostreet

3xOSC is an FL factory plugin. That is considered a software synthesizer, or VST, but I don't think it is.