Analogue Filter with resonance
This is an attempt to simulate a mass/spring/damper system which also happily is a lowpass filter with resonance. I have built this from the ground up using documentation found on www.vaxman.de (a very good resource for analogue computing) and elsewhere. I am no expert so the scaling of internal values may not be correct, a little help here would be appreciated. The frequency tracking is quite linear and extends to SR*0.498
This download is a testing ensemble. This filter may also sound quite nice in Eige Kitamuras Lunchbox!
Thanks to Robin Davies for the oscillator in the test ens. Let me know what you think.
ps: any of the few people who got the version of this with Junatikaudio should delete the junatik ens because of 1#qnan issues (crash and gnarr) I am not reponsible for damaged equipment/hearing!
UPDATE : added enough resonance dependent scaling of the cutoff frequency to prevent some NaNs. NaNs may still occur so be careful. This update has been posted after comments 1-5.