VST2 on a Mac

Bitwig Studio doesn’t support VST3 or AU. Just bought Halion 5 and it seems it’s only AU or VST3 on Mac. Any workarounds?

This is correct and there is no workaround, unfortunately. Only solution is that Bitwig start supporting VST3 or that Steinberg releases a VST2 for Mac.

Take a look at this:
http://www.askaudiomag.com/articles/connecting-bitwig-studio-to-other-audio-applications