[linux-audio-user] Denormal problems with some LADSPA plugins

[Q]

Hi everyone

I'm having denormal problems with some LADSPA plugins, mainly the Triple 
Band Parametric with Shelves, Plate Reverb and Glame High Pass filter 
(which I started to use to replace that function in the Parametric). 
They are really useful plugins but after a short space of time an 
instance of one of them will start racking up thousands of Xruns and 
processor usage climbs inexorably towards 100%.

I occasionally had problems before but it seems a lot worse since I 
moved to DeMuDi 1.3 and the later version of Ardour that ships with it, 
but it's probably just a case of selective memory.

Sampo suggested on the Ardour forum that I should try compiling the SWH 
plugins using SSE instructions -- thanks for that. I got the latest tar 
of the plugs and compiled them using those instructions but 
unfortunately it hasn't cured the problem. Probably I did something 
wrong -- I can't say I fully understood the options in the Readme.

Has anyone any advice on how to cure this problem, or any ideas where I 
might have gone wrong compiling with SSE instructions? Preferably in 
words of one syllable or fewer ;-)

I'm using a Pentium 4 if that makes any difference to anything.

Thanks in advance,

qb