Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
Support my Feature Request for AUv3 Support for Kushview Element on MacOS
Kushview Element is a capable open source plugin host for Mac and Windows that can also act as a plugin wrapper. I think it has a lot if similarities with AUM as it is light weight and it also has routing capabilities. It already supports AUv2 on Macs. Looking at the sources it seems to use the JUCE framework that does support AUv3 but the AUv3 support is deactivated. I opened a feature request at github: https://github.com/kushview/Element/issues/510 - please support it if you like the idea.
This would be a solution for users of DAWs without AUv3 support like Ableton or Bitwig. It could also be a great cheap/free alternative to Apple’s MainStage.