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SVF self-oscillation
MUFF WIGGLER Forum Index -> Oakley Sound Systems  
Author SVF self-oscillation
BassPudding
when using the SVF as an oscillator, is it normal behaviour that the filter will only begin to self-oscillate at very high frequencies? i can see why this would make sense, but often once i've got it oscillating and leave it in the lower registers for subs and bass drum, after a minute or so it stops self oscillating... which is a shame cz it makes a damn fat sounding kick drum!
Synthbuilder
BassPudding wrote:
when using the SVF as an oscillator, is it normal behaviour that the filter will only begin to self-oscillate at very high frequencies?

Yes. Left to its own devices the SVF will only oscillate at the higher frequencies. However, you can 'ping' the filter to get it to ring at any frequency. Send a trigger type signal into the audio input (short attack-decay CV from VRG, ADSR, etc). This will excite the SVF which has resonance set to just not quite oscillate. The amount of resonance and cut-off frequency will determine the resonance time.

The other way to do it is to pulse the cut-off frequency briefly high with a short AD CV. This will trick the SVF into oscillation.

Alternatively use the COTA. The COTA behaves equally across the whole audio band so behaves more predictably at lower frequencies than the SVF.

Tony
BassPudding
cheers tony, that helps a lot. are the supperladder filters also suitable for this or is it something that the COTA excels at especially?

also, would you be able to damage a module by feeding its output back into iteself, or in creating a feedback loop for frequency modulation? i noticed some interesting waveforms feeding the SVF output back into the CV-in!
Synthbuilder
BassPudding wrote:
would you be able to damage a module by feeding its output back into iteself, or in creating a feedback loop for frequency modulation?

No. Well, not on an Oakley module. All the output and inputs are protected against abuse. So feel free to connect any socket on any module to any socket on any other module if it gives you a great sound.

Tony
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