[ardour-dev] Re: 0.9beta30 + freeverb?

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Mon Sep 19 08:42:34 PDT 2005

On Mon, 2005-09-19 at 11:21 +0300, Sampo Savolainen wrote:
> Quoting Peder Hedlund <peder at musikhuset.org>:
> > I really think some smart guy needs to look into this further.
> I can't say that I'm that smart, but on the behalf of the other developers I
> can say that we promise to fix this.
> This is easily repeatable in at least moderately large sessions by un-muting
> a bus with a reverb while transport is playing. This noise is probably due
> to mistakenly feeding uninitialized buffers to the plugins. Another theory
> is that this is related to the crackling problem fixed between beta29 and 30.

>From what I hear it looks like a cumulative effect. The wrong buffer is
fed to the reverb, and whatever comes out is also stored on this buffer
(or whatever). The next time the transport is stopped/start this louder
buffer is again fed to the effects and the noise is louder, and so on
and so forth. After 5 or 6 tries the overload indicator in the output
master goes up to 100's of dB's :-)

> Have no fear, we will fix this before 0.99. But I can't promise when that
> comes out though.. :)

Too bad. I'm hesitant to release beta30 to Planet CCRMA users with this
problem. It kind of makes ardour unusable. 

BTW, this was not a big session and the problem manifests itself
immediately, with only two tracks feeding one plugin (freeverb). I have
only tried to far on Fedora Core 3, will try again on FC4 just in case
it is a compiler problem (I doubt it). 

Otherwise beta30 looks great! (but my tests are very simplistic)
-- Fernando

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