Upgraded from reason 4 to reason 6. In reason 4 I could have 16 instruments going with effect and my CPU would run about 35 percent. With reason 6 I get about 8 instruments going and the CPU runs about 70 and sometimes hits 90 percent and I get "ur computer is too slow". I have 2.2 ghz Celeron single core processor with 3 gigs of ram(windows 7). Make sure all my task manager prossess s r closed BTW. I just ordered a 3.1 ghz dual core processor. Does anyone think this will help? Side problem. Have a an usb condensor Mic with asioall driver and it makes cracking noises. I also have an m audio box mini. Should I get a 1/4 jack Mic and switch over to my mbox when I record vocals? Would that help the signal(using mbox with Mic hooked into it over a usb mic)? Mbox is hooked to my krk monitors but I like making 80 percent of the beat on my logic speakers with sub. Sorry about my sloppyness. Tired and typing on phone. Thanks!