You need a Mac or PC that meets the minimum requirements as shown in the sidebar of the Features page. That will allow you to use the Standalone version at least. You probably will wish to use it in a host DAW though so you probably also need a DAW that's compatible with either the VST, Audio Units or RTAS formats too. This includes DAWs such as Logic, Cubase, Digital Performer, Live, Pro Tools, GarageBand, and many more - pretty much everything. But check and test out the demo version downloadable from this site before ordering. You also need some hard disk space and a keyboard to trigger Beat Producer too - but you almost certainly have these anyway. Go back!