Resonance info needed

[Thomas Robert de Massy]

Hi,
    Is someone can give me a good explanation on how the resonance in a VCF works
(from an electronic point of view). Since it's also often called Q, I thought it was a pass band and that using the resonance knobs you were changing the quality of the filter, changing the bandwidth. But as I saw on many synth info pages, they are always talking about using a feedback to send back the filtered signal in the input. That's the part I have some difficulty to understand. I think a simple resonance filter schematic could help me figure out how it works, it seems very simple but I need more info.

Thanks
          Thomas
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