Sorry, I missed this. AU is not confirmed but will be evaluated before Rack v2 is released. If approved, it will likely released several weeks after the initial Rack for DAWs release. If you purchase Rack for DAWs, you’ll get the AU version in an update. All updates will be free after purchase. (Paid updates of the same product isn’t how we do things at VCV.)
See Frequently Asked Questions - VCV Rack Manual. If you talk to any audio software expert (including me), they’ll tell you IPC audio is a joke. Mutexes in audio are well-known as a Bad Idea™. Now imagine that but a tenth the reliability. If you want to adopt VCV Bridge, you’re free to do so. It’s open-source. But there’s a reason no programmer of sane mind has touched that code.
Take a guess at how many tech support queries I’ve gotten about VCV Bridge. Probably 1000-1500. Now guess how much money I’ve made on it. Probably negative $ because everyone says “Wow, this shit never works, VCV sucks.” You’ll then see why I decided to kill the project, really easy decision.