[ardour-dev] Deafening noise from plugins when auditioning/unmuting

Tom Szilagyi st444 at hszk.bme.hu
Fri Aug 26 10:56:00 PDT 2005

> Tom Szilagyi wrote:
> > I have also noticed a phenomenon previously that may be related
> > to this issue. Sometimes Ardour gets kicked from jack (in fact,
> > this almost always happens at the end of a recording session when
> > playback & recording is being stopped, never in the middle of the
> > recording or when there is only playback). On these occasions I
> > restart Ardour, and while the session is loading, I sometimes hear
> > a very short sound impulse in which I can recognize some of the
> > previously recorded tones, so it's not just random noise, but
> > some existing session data.

Forgot to add, I use no plugins at all at this stage (I add them later
when all material is recorded, so the session is "pure" during recording).

IIRC the above phenomenon does not occur if I restart Jack, too, not
just Ardour. (I usually leave Jack as it is out of lazyness, and restart
Ardour only.)

On Thu, 25 Aug 2005, Remco Poelstra wrote:
> Are you sure that you zero all buffers in jack if you don't place audio data
> in them? I had this similar problem and doing a memset() if I didn't had audio
> data available solved it.

The plugin doesn't know if audio data is "available"; if the host has no
data the plugin doesn't get called. OTOH, the plugin is called even when
the transport is not rolling (for me at least, it's configurable in
Ardour), and the plugin can't decide if it's actually receiving data from
the multitrack or just zero buffers.

I haven't tried yet, but it comes to my mind that enabling "Stop plugins
with transport" in Ardour might be a possible workaround to the issue.


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