Why is a analog resonant filter sweep continuous sine when partials are not ?

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Hello! A simple question...when I do a resonant sweep on an analog saw wave for example, the resonant sine is a continuous sweeping sound. From my understanding, any wave is made up of fundamental partials which are discrete. The dfference can be heard when sweeping through an additive partial filter when using an additive saw wave for example. The results are very different than when using an analog filter. What would be the reason? Perhaps the noise floor on analog oscs explain this?

Thanks!

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Resonant filter has some bandwidth which covers a number of partials, even with very low amplitudes.
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By low amplitude would that mean noise from the osc source? Thanks!

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(Most) analogue filters start to self-oscillate at high resonance gain. They don't need further excitement from the input frequency spectrum to ring at the cutoff frequency. Hence they may sweep continuously.

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Makes sense then ! Thanks so much Urs!

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