[Leonard Ritter] >On Tue, 2007-03-13 at 10:08 -0500, Dave Phillips wrote: >> 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.
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
