SynthMakerinverseroom ·
...doesn't self-oscillate the way the multimode filter does? Don't Moog filters generally self-oscillate?
How come the Moog filter...
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skOre ·
Well, filters don't really oscillate afaik, maybe you are talking about characteristic Resonances that you want to achieve? Maybe the SM moog-filter is too gentle... (it shouldn't be, right? 😉)
stefan ·
skOre wrote: Well, filters don't really oscillate afaik, maybe you are talking about characteristic Resonances that you want to achieve? Maybe the SM moog-filter is too gentle... (it shouldn't be, right? 😉)
Self-oscillating filters oscillate 🙂
inverseroom ·
Well...some 24db filters, when the resonance is way up, overdrive into self-oscillation. On the Micromoog this is actually a feature...you can use the filter as an oscillator without even putting any other sound through it. Other filters, like the Yamaha SY-1/2 slash GX-1 filter, don't do this...they're tamer (though, like the SM Moog filter, can sound good anyway).
But I would have expected a Moog emulation to push over into self-oscillation...
rl ·
It's definitely possible to implement self-oscillation. For a quick proof modify the code of the filter a little by expanding the feedback:
... streamin extra; ... fb=res*(1.0-0.15*f2)*extra; ...
feed a float > 1 for the extra value and the filter goes into self oscillation. The tricky part now is to find a good formula for stable oscillation over the frequency and resonance ranges.
inverseroom ·
rl wrote: It's definitely possible to implement self-oscillation. For a quick proof modify the code of the filter a little by expanding the feedback:
... streamin extra; ... fb=res*(1.0-0.15*f2)*extra; ...
feed a float > 1 for the extra value and the filter goes into self oscillation. The tricky part now is to find a good formula for stable oscillation over the frequency and resonance ranges.
Thank you, rl! I have never coded a thing in my life, but I'll try to get in there and fiddle around a bit.
As far as stability goes...it's not necessarily a good thing, especially in a filter, IMHO! I'm interested in exploring stuff right at the edge of chaos...these are often the sounds I like to hear and play in music.
Vulcano ·
Try
fb=res*(1.0-0.15*f2)*4
to start ..
Anyway, you will find that it does strange things on low frequencies/high cut.
I think is time to try other mathematical models from http://www.musicdsp.org.
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