Self Resonant filter

[loopman]

Hi guys,
I have a question about my Radias, maybe it has already been asked and answered many times, but I need it to be explained again here, because only now I have a Radias under my hands, finally.

Well, my question is : there is a way to achieve a true self-oscillating filter?

Thanks

[voip]

Self oscillating filters can sound quite unpleasant, but try patch A05 BPF Plus, and crank up the Resonance control, then vary the Cutoff. It won't quite go into full oscillation, but gets close.

.

[Synthoid]

Self oscillating filters can sound quite unpleasant

Also illegal in some states and countries.

[loopman]

I mean a self-oscillating filter without hitting any key

[voip]

If the output is fed back to the input, the Radias should self oscillate when the overall gain of the system i.e. audio input level, volume, and resonance, give sufficient feedback for self oscillation.

There may be another way - discussed on a Gearslutz forum: https://www.gearslutz.com/board/electro ... lters.html

where the poster writes:

"I was very surprised surprised to find out recently that the Korg Radias' filter can self-oscillate. Turn all oscillators down to zero, resonance up to max, and then the "punch" parameter in the drive menu up to basically any value above zero.

Although it needs to be triggered by the punch parameter, this is to all intents and purposes true self-oscillation with no other sound source active. Turn the resonance down and you have no sound at all..

Both filters will do it simultaneously if set to parallel routing.

Turn drive up and the sine wave will morph into a square wave.
"

.