Phat Filters

I'm an electrical engineer and although I can't say that I have quantified what the Moog filter (the original "fat" filter) does to the sound of the analog synth oscillators, my understanding is that it does contribute to the sound by way of some slight distortion (probably not unlike electrical guitar "fuzz" effects) which make the sound fuller and more harmonic-rich (fat - phat?).

So in this case, the filter may be actually contributing to the harmonic content of the sound, even without the self-oscillation effects (Moog calls this resonance).

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