Alecio, to answer the question you asked me, AltiVerb for Pro Tools is a HTDM plug, which means that it uses your host computer's CPU but otherwise interacts with you and your mix just like any other PT plug. It's a hog, no doubt about it... expect it to tie up about half of, say, a 933 MHz G4, and 60% of a 733. Of course, in my world of Digital Performer, the host CPU is doing everything else too. But yeah, it wont matter how many farm cards etc you have.