I'm not on the Mac at the moment and I haven't tried the RewireVST with the new version http://energy-xt.com/rewire-vst.html
just load it in a midi track and slave one of you rewire DAWs.
The issue was the audio was crackling coming from the DAW into Biab.
You can also try it in https://jstuff.wordpress.com/pluginflipflop/ if you have JBridgeM