They're quite different.  bp~ is the cheapest possible bandpass filter
(as far as I know).  vcf~ is a one-pole complex filter whose outputs are
the real and imaginry parts.  The real part may be used as a resonant
bandpass filter and the imaginary as a resonant low-pass filter, but
they can be combined to make other possibilities.

It's possible to graph their frequency responses using the help patch
"H10.measurement.pd' in 3.audio.examples.

cheers
Miller

On Sat, Apr 12, 2014 at 04:28:11AM -0300, Alexandre Torres Porres wrote:
> Hi there, who can confirm that both [bp~] and [vcf~] are exactly the really
> same thingy? The code looks quite different...
>
> Moreover, why the two outlets for vcf~? Help doesn't say anything.
>
> Thanks

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