Here’s Fons’ response. I have lifted the limiting on the resonance.

> Begin forwarded message:
> 
> From: Fons Adriaensen 
> Subject: Re: HNY and ports
> Date: 17 January 2016 09:50:19 GMT
> To: Victor Lazzarini 
> 
> Hi Victor, HNY to you !
> 
>> Just wanted to let you know that I’ve ported your LADSPA moog filters to Csound following
>> user requests. Some users also asked whether I can lift the limiting on the resonance (currently 1),
>> so I thought it was simpler to ask you.
> 
> Sure you can remove or increase the limit. The effect would be to increase
> the maximum frequency at which the filters will sustain oscillation. For
> lpf1 this is currently around 2 kHz, for lpf2 it's 3 kHz and for lpf4 and
> lpf4 it is 8 kHz.
> 
> The first two exist only because they are bit less CPU hungry than the
> others. Twelve years ago that made sense, today I'd probably just release
> lpf3 and/or lpf4.
> 
> But each of them will behave differently when pushed beyond the limits,
> e.g when driving them into oscillation while having an input signal,
> and for artistic use, which it what they are meant for, of course anything
> is allowed.
> 
> IIRC these filters where my very first contribution to Linux audio.
> Strange to revisit them after all that time...
> 
> Ciao,
> 
> -- 
> FA
> 
> A world of exhaustive, reliable metadata would be an utopia.
> It's also a pipe-dream, founded on self-delusion, nerd hubris
> and hysterically inflated market opportunities. (Cory Doctorow)
> 

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