Hi all, Perhaps Julius O. Smith or some expert in filter resonance knows the answer:
I have an app I built using the Karplus-Strong example in one of the "getting started" tutorial. It uses fi.fb_fcomb at its heart -- a comb filter excited by a burst of noise, then allowed to resonate and decay like a string. It is an _awesome_ sounding "superclav" as I call it; I have been playing Bach on it, it is expressive and its character is super-perfect for Baroque music. My issue is: I have set up a well-twmpered 12-note gamut using a waveform table, it works really well. But for some reason, at SR=48000, every C-sharp in my gamut, regardless of octave played, has an extra bit of bright "ping" that makes it stand out from the others. I suspect that particular pitch somehow reinforces, in the combo filter, some resonance mode and its harmonics. Does anyone have any ideas on how to mitigate and work around this? I have tried post-EQing the signal, but it's tough to do it for each harmonic, and it ends up doing the reverse: making each C-sharp, if the band-reject EQ resonance is narrow enough, sound too "pinched". Perhaps I need to shift my overall gamut by some constant so that no pitch hits the resonance peak? That's not ideal, though, so I am wondering if perhaps it's possible to mitigate this by pre-filyering the noise burst or similar, in such a way that the peak gets reduced on the excitation-end of things. Any/all ideas here are appreciated, and thanks again to the wonderful devs for giving us this powerful tool. -Aaron
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