zero delay feedback SVF in gen~

I have been experimenting with some zero delay feedback filters, as used in the latest and greatest virtual analogue synths. I'm a long way from understanding it myself, but i've had fun playing with some code that others have published. Attached is an SVF. The cutoff freq can be much higher than the standard svf cutoff freq.

For more info see...

http://ay-kedi.narod2.ru/VAFilterDesign.pdf http://www.kvraudio.com/forum/viewtopic.php?p=4932644&highlight=tpt+zdfsvf#4932644 http://www.xils-lab.com/pages/Zero-Delay-Feedback-Filters.html

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