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Analogue Filter

Analogue Filter with resonance

(14 Votes)
2.2 (Updated 14 years ago)
February 14, 2007
Reaktor 5 or lower
Other Test Area


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 (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!
Rgds, BG.
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.


Barry Galloway
12 years ago
Sorry this is is a bit shit, check out vadims filters, go Dr. Sync!
Phil Durrant
14 years ago
both versions only work for a few seconds on my Mac before the dreaded Nan Nan comes up and the sound stops working. sorry to say this but there is something wrong with the coding on this at the moment. fwiw, i was using the audio input selection
hanno mosoiu
14 years ago
i voted a 10 and it worked, he he... -now the average went up to 8...
raphael esterson
14 years ago
Thanks for this. Sounds good, although I think it could use some work on the scaling (not sure if that's the right term - i mean the rate of change of frequency) A gripe with the website: I voted 10 but it shows one vote at 6. What gives? Mods, can we fix this?
GG.G SakabeaT
14 years ago
WTF!i hit "refresh" and it post my first msg again!!!
GG.G SakabeaT
14 years ago
the filter macro still outputs "1#qnan"...
GG.G SakabeaT
14 years ago
this one sounds good and i love this kind of upload. but there's a nasty bug,i cant play more than few minutes (secondes...) with it because it starts to make a "buzz" (BUZZZZZZ......) and i have to restart reaktor... no time to investigate more, btw i'm on winxp