Resonant body, poly or mono?
I am making a basic karplus strong instrument .
Three delay lines for the strings ( poly ) and 6 parallel comb filters for the resonant body .
I am deciding if the resoant body should be set to poly or rather mono as an effect .
Mono
Or poly ?
Comments
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It seems to me intuitively it ought to be mono since most (electro-)acoustic stringed instruments have a bridge that couples the strings together which in turn causes the soundboard to resonate; and that sort of inter-string crosstalk is a big component of those instruments' sound. I think making the resonator polyphonic, apart from the additional CPU overhead, would behave more like a bunch of monochords. But, hey, see what you like better and follow your muse.
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since body models are considered to be a linear time-invariant system it shouldn't really matter (unless maybe you are using feedback for coupling, in which case as Big Gnome said i would go mono)
it is also possible to forego the body model by filtering the noise excitation instead as i believe as a LTI system they are equivalent
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If you're emulating an acoustic instrument, then modeling the body resonances with a single monophonic circuit is all that's required.
Colin has a zero-latency convolution machine somewhere in the UL. You can load impulses into it from actual instruments and run your KS tones through them. I used an early version of it in Serenade, creating wooden body resonances from real instruments. It's a lot of fun.
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Sounds cool, mono resonance will work unless you want to mimic a pair of stereo mics.
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Here's the ensemble , it's pretty simple and nothing spectacular
The body can be set to poly or mono , just place it before the voice combiner when poly0 -
I like it, definitely on to something. I looked that up and it seems the theory dates back 30 or 40 years. What possessed you to try it.
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Well the resonant body (comb filters ) was something that the developer of Alpha forever showcased , and I thought why not give it a try in reaktor .
It does make sense since these are just verry dense reflections
The karplus strong part (strings ) is really simple , just a tuned delay line with a gentle lowpass in the feedback loop for damping (3 n this icase ) , coupling is feeding one string into the other , altough I am sure it's far more advanced then my simple implementation but it does the job0 -
It's natural sounding to me. Probably because it's a decent fundamental model of the way instruments naturally interact. Acoustic instruments like the string family naturally act like this. The string resonate loudly on some notes and dampen on others. The feedback is simply acting like the wood vibrates. The wood cross couples vibrations into the other strings and sets them in motion. It's known as sympathetic resonance, something I learned about tuning piano's. Well, ok, just chatting. Talk later
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I duplicated the resonator for true stereo , small adjustments to the gain coefficients of the comb filters(for both resoantor banks) has a huge effect .
Me like0 -
Uh huh, ambience in a way, isn't it.
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