[linux-audio-user] Issue with TAP plugins

Hello. I encounter a weird and irritating problem which seem to concern TAP plugins. Sometimes there seem to be a bad wire in my hardware, quite everything start to sound with lots of cracks, turning all the sound system to be unusable. After hours and hours investigating, I notice that when I turn off all TAP plugins, things reintegrate normality. For example Zynaddsubfx often, not always, produces rains of CRR CRR CRR when playing a sequence together with an Om patch which uses TAP reverb or TAP pink noise. Turning off the Om patch produces immediatly a normal sound in Zynaddsubfx (and also deleting the TAP plugins from the patch)... The worse thing is that some of my mixes have become completely unusable in Ardour. I intensively use the TAP reverb on some tracks, everything worked fine around September and before, even if there were occasionnaly, and randomly, some of these noises. But now there are some mixes I just can't play anymore without turning off all the TAPS reverbs. I even encounter tons and tons of xruns... I regularly upgrade my gentoo system and the kernel, *everything works really fine* but this precise point which seems to get worse and worse. I have *not* upgraded Ardour (0.99.3 version). I know that softwares like jack-rack complains when one try to use TAP plugins, saying they are not real time, but those plugins seemed to function normally before with lot of other softs... And it would be really a pity to stop using them. Two questions : am I alone to encounter this issue, and what kind of debug information could be of a help ? My setup is dual Opteron, 2 Go RAM, SATA Drives, RME Multiface II, Gentoo 2006.1, kernel : 2.6.18.1 #1 SMP PREEMPT and Alsa Version 1.0.12rc1 provided with this vanilla kernel, normally patched for real time. Thanks in advance for any kind of help, Y.