get a programm that can rewire and has vsti support

i have acid pro 4.0 is that good? and what does rewiring mean?

rewire allows you to use your host in another host as a plugin. this is good for people that like working in reason but want to use VSTi's like pro53 cuz reason is a closed platform and doesnt let you use VST plugins. cubase can however so many people rewire reason through cubase, mainly for the VSTs and the (some would say better) rendering engine. i think acid supports rewire. check the manual.