resonance

High resonance settings produce quacking funk sounds from envelope filters, since louder signals open the filter more and the resonance intensifies that response¹. It can also sound metallic, which sources associate with industrial metal styles², percussive synth tones³, and flanger territory from metallic resonance to jet-plane whoosh⁴. On phasers and choruses, a resonance knob increases intensity or shifts the response toward flanger and ring-modulation-like tones⁵⁶. Filter designs may use high preset resonance for maximum harmonic content without self-oscillation⁷.