Perhaps the manual is not the place for such explanations;
it can have (and I think it has), though, references to
where
you can find information about it. I think Dodge & Jerse is
mentioned somewhere. That book is probably a good general
intro for musicians and less technically-minded users.

And of course, there is the Csound book.

Victor

>
> I wasn't really sure what the difference was either.
>
> I found that the following Wikipedia article explained it
> enough for me:
>
> http://en.wikipedia.org/wiki/Butterworth_filter
> Butterworth filter - Wikipedia, the free encyclopedia
>
> This article is geared more towards the electrical
> engineering crowd (it has circuit diagrams), but the
> concepts seem to be clear enough on how they apply to
> musical signals as well.
>
> You won't find answers to all Csound-related terminology
> at Wikipedia but you may find many of them :)
>
> Anthony Kozar
> anthonykozar AT sbcglobal DOT net
>
>
> S. Massy wrote on 2/11/06 3:52 AM:
>
> > While I know what a low-pass
> > filter is, I'm afraid that what a "second order
> > Butterworth" lp filter is and how it differs from other
> > lp filters is beyond me. Is there any extensive online
> > resource such as a glossary where such information might
> be readily available?
>
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