[LAU] TAP and other LADSPA plugins cause... dead silence?

[Andrew Gaydenko]

======= On Thursday 17 May 2007, you wrote: =======
> I have the same problem with the TAP plugins ad some other users have
> reported too. It doesn't seem to be a problem with denormals since CPU
> use remains low.
> 
> Hector
> 
> 
> On 5/16/07, mAlessio <malessio at ale.it> wrote:
> >
> > Il giorno 16/mag/07, alle ore 09:22, Ken Restivo ha scritto:
> >
> > > -----BEGIN PGP SIGNED MESSAGE-----
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> > > I've noticed a phenomenon many months ago: certain LADSPA plugins,
> > > when I enable them, cause all audio to stop coming out of the
> > > effects chain.
> > >
> > > This was a common problem with jack-rack. it got so annoying, I
> > > stopped using jack-rack. The same plugins that would cause jack-
> > > rack to go silent, worked fine in Ardour. So I started using Ardour
> > > (0.99) instead for effects.
> > >
> > > Now, on a 64-bit dual-core Intel machine, I'm noticing the problem
> > > even in Ardour (2.0.2). And in ecasound too, and jack-rack. If for
> > > example I add the TAP Rotary Speaker plugin to any of Ardour2, jack-
> > > rack, or ecasound, all audio stops. If I remove the TAP Rotary
> > > Speaker, audio is fine.
> > >
> > > Why is this?
> > >
> > > - -ken
> > > -----BEGIN PGP SIGNATURE-----
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> > > iD8DBQFGSrEme8HF+6xeOIcRAn/5AJ0ZXMAKlyaBinWnd5f/gjScxkojXwCfZ867
> > > 1n3py1Y2VYV9AjUO/ro3Njg=
> > > =Pxto
> > > -----END PGP SIGNATURE-----
> >
> > Have you noticed a heavy CPU load? In this case this is a well known
> > (but unsolved) problem. Some plugins (TAP for sure) use some
> > instruction that cause abnormal CPU load on moder PC.
> >
> > Take a look on the gray box at http://tap-plugins.sourceforge.net/
> >

Probably, it isn't interesting already, but I'm the next with the issue (Core 2 Duo,
Gentoo/~amd64). Have tried TAP Rotary Speaker just now. Aqualung and jack-rack were
used as hosts with the same effect - silence with almost zero CPU eating.


Andrew