Patch makes sounds even when osc1 + osc2 level = 0

I want to understand why a patch I made still produces sound when both osc1 and osc2 level is zero. I’ve got zero sub osc on both. All LFOs are off. Page 2 on both osc is defualt.

EDIT -its something to do with the filter.
Can someone that is knowledge help explain me whats going on!?

Hmmm maybe its a bug!? when i copy the filter page from the patch that makes the sound to my test sound - i hear a sound, despite the above, but when i move f1 to zero and back the sound goes… is that normal behaviour?

EDIT x2 – something to do with the resonance being cracked up…

case closed ?! - some filters self-resonate (sin) at high res/peak/q

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yes! sorry for the rambling post. self resonating filters new to me. you can delete! i can google more info myself