linuxaudio.org

> From: Fons Adriaensen

quoted text
> Subject: Re: [LAD] Plugin buffer size restrictions

> On Mon, May 28, 2012 at 06:05:20PM +0300, Stefano D'Angelo wrote:

quoted text
>

> > IMO it's easily said: if control rate < audio rate it's plugin's

> > responsibility, otherwise the host feeds upsampled/filtered control

> > signals at audio rate to the plugin and all problems evaporate...

>

> The don't evaporate, they explode.

>

> Take a filter plugin. Calculating the actual filter coefficients from

> the 'user' parameters (frequency, gain, etc..) can easily be

> 10..1000 times more complex than actually using those coefficients to

> process one sample. So you really don't want to do that at the audio

> sample rate.

True, But with synths at least, recalculating the filter at audio rate is

routine these days. Admittedly we are pre-calculating the full range of

coefficients in advance.

 You do get *very* nice filter sweeps and blips at full audio-rate

modulation.
Best Regards,

Jeff
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