13 Mar
2007
13 Mar
'07
11:54 a.m.
[Leonard Ritter]
On Tue, 2007-03-13 at 10:08 -0500, Dave Phillips
wrote:
Unfortunately, there seems to be a denormal problem with at least
AmpIV in CAPS. The fix you mention works reasonably well for most
plugins, but in the Amp series there's a simple dc-blocking IIR
running at 8x fs that as far as I remember isn't 'renormalized' -- I
keep meaning to verify the problem and this likely culprit, but I
never seem to get around to it.
Dave, I think your problems may well be caused by denormals; in fact I
think it's the most probable cause. Does the problem persist if you
remove AmpIV from the processing setup? The other CAPS plugins
_should_ be safe (can't guarantee 100% though).
Cheers, Tim
So, if anyone has anything to add to Chris's
assessment, I'd like to
know about it. If the problem is indeed related to denormals, is there
a
way to fix it ? Comments and suggestions are most welcome.
i made a few experiences regarding to denormals in Aldrin/libzzub.
numerous plugins had their own fixes for denormalization (and i know
that CAPS has a fix too, which is to add a -250dB square wave to avoid
the value to go off the scale). AMD cpus do not have that problem most
of the time, so the problem relates mostly to Intel cpus.