Re: [Audacity-devel] Acoustic analysis: Nyquist, LADSPA or VST?

[Dominic M. <do...@au...>]

On Apr 4, 2004, at 9:56 AM, Mr.Freeze wrote:
> Hi,
> I have to write quickly (by the end of the month) an (open-source)
> cross-platform plugin suite for acoustic analysis, hence my choice for=20=

> those
> used in Audacity. It's about generating misc signals (log/lin sweep=20
> sines, MLS)
> and de/convoluting. I'd say I'm A-OK with the math, but I've never=20
> written any
> plugin, just Matlab m-files or light C/C++ programs: it's high time
> understanding how to write under the misc restrictions generated by=20
> the plugin
> protocol...
>
> Check the following site to get an overall idea:
> http://www.ramsete.com/Aurora/
>
> Firstly, should I go for LADSPA plugins? Yet they ARE NOT supported=20
> under
> Windows, because they have to be ported to VST (thinking of GVerb...),=20=

> aren't they?\

Actually Audacity does load LADSPA plugins on Windows and Mac OS.  I'm=20=

not aware of
any other program that does, but if you can do everything within=20
Audacity, that
should work.

> Then should I go for VST plugins? This suite will be used exclusively=20=

> during the
> test phase on Windows, even if I'm only running Linux at home. Are VST=20=

> generator
> plugins simply called VSTi's, ie do I have to struggle to code a=20
> "synth" plugin?

Audacity doesn't support synth plug-ins or instruments, just effect=20
plug-ins.
You should be able to create a generator just by taking no inputs and=20
just
generating outputs; Audacity will then put it in the "Generate" menu.

> When it comes to Nyquist plugins, I've read the 3-page Nyquist manual=20=

> on the
> audacity site (http://audacity.sourceforge.net/nyquist) and the linked
> documentation by the way to the "official" site. I must admit I'm a=20
> bit lost...
> For example, I couldn't find anywhere else than on the audacity page=20=

> information
> on functions such as ";control". Is it possible to use tick boxes=20
> instead of
> sliders?

Sorry, no tick boxes supported yet.  :(  I think that everything you=20
want to
do (sine sweeps, convolution, etc.) can be done within Nyquist, but if=20=

you want
to know for sure, you should ask Roger Dannenberg (Nyquist's author). =20=

I'd
recommend that you download the standalone version of Nyquist if you=20
want to
try it; one you get a real Nyquist program running to do what you want=20=

I can
help you turn it into an Audacity plug-in if that's all that's left.

> Is there's a way for any of the 3 to do convolution from on audacity=20=

> track to
> another? Or should it be solved by the clipboard?

The VST and LADSPA interfaces are not set up to support this.  It could=20=

be
done in Nyquist; in Nyquist you could select two tracks and have it=20
interpret
the first one as the source audio and the second one as the track to be
convolved.

- Dominic


> Can you help me to sort all this confusion?
>
> Thanks,
> Christian Frisson
>
> (My apologies for triple-posting by the way... No subject, then bad=20
> sender email...)
>
>
>
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