I'm Cj from France.
I' have these problems as well since I changed my configuration...
Before asus P4G8Xdeluxe, P4B, AGP with ATI, 2mram, I had no buzz.
Now I ugrated my computer in order to play with powerfull plugs in cubase.
Asus Commando, C2D e6600, 2mo ram, GPU Nvidia.
I use 1 pulsar 1 plus and 1 plulsar 2 classic.
And i don't want to change !!!!
I won power in cubase ! But I lost this : Impossible to use the pulsar wave driver to get my mix into wavelab

I got some audio clics, clips, buzz, etc... so first I try to change the wavelab preferences "buffer waves" but it was wronger and wronger

I reeinstalled my system several time, but nothing has changed.
Maybe I'm going to change my graphic card for a GPU ATI after seeing this :
http://www.kvraudio.com/forum/viewtopic ... d7207c4f5e
I use the same plug in Plugsound Pro and have the same problem !
Maybe I wonder if pulsar and PSPro accept else GPU than ATI ????