I can get about 8 voices on my set-up with GPO as an RTAS Plug in. Using the internal sound on my Mac and Digital Performer I can get about 20. As Solitan mentioned there is a problem either with the NI or Digidesign architecture that makes it perform very poorly. SUPPOSEDLY, there has been some changes made in PT 6.9 and the latest Native Instruments offerings that is going to solve this once and for all, but Gary Garritan keeps saying, "It is coming, it is coming!" but that has been for about a year. I don't think it is his fault. As far as I know it is Native Instruments that spends 98% of it's resources on bringing products to the market, and 2% maintaining and upgrading them. You'll find many a pissed of NI user about lack of technical support.