Hi people. I wonder what's the meaning of the 'resonance' SFZ opcode for bandstop filter.
I've found experimentally that the more it is, the less attenuation of the center frequency is and the less bandwidth is, the dependency looks nonlinear. When it's zero, attenuation is maximal, about 45dB, and bandwidth is about two octaves, from cutoff/2 to cutoff*2. Starting with resonance=65, spectrum is almost the same as without any filtering. I read https://webaudio.github.io/Audio-EQ-Cookbook/Audio-EQ-Cookbook.txt, there's a lot of formulae, but it turns out that the formulae in the LinuxSampler sources are a bit different, maybe after some simplifications. So, does anyone know how exactly this opcode value is related to bandstop filter bandwidth mathematically? Thanks. -- Regards, Fedir Chernyavskyy
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