Yes, It requires a vst host. Sonar 3, Cubase, n track, or any other VST host will do. Bidule is an example of a freeware host( for now while it's still in beta, but it works fine )

ZR3 is a very decent piece of software ( especially for free ). I don't think it compares at all to the B4 though. I don't think DA organ does either.

[This message has been edited by Bluezplayer (edited 02-03-2004).]