I’ve had a VRM box now for some time – it’s excellent. In fact I’ve come to rely on it, so I thought I’d check whether it worked with OSX Mavericks (yup – been a Mac user for 7 or so years too – currently on Mountain Lion).
Glad I checked. At the moment, according to Focusrite tech support, it isn’t compatible, but they’re working on it. They recommend subscribing to their beta site for email alerts for new releases http://beta.focusrite.com