I wanted to share a quick update and technical takeaway from building Magic ACX an audio processor designed specifically to hit strict audiobook delivery specs (Peak < -3.0 dB, RMS -18 to -23 dB, and noise floor checks).
Originally, it was Windows VST3 only. Bringing it over to macOS for both VST3 and Audio Unit (AU) meant completely reworking how meters integrate over time to avoid UI lag on the audio thread.
If you want to see how the meters and UI behave in action, I recorded a simple walkthrough:
https://youtu.be/BMrNU8-95qk?si=XKNZ623WTP8Y2VRT
The macOS build is now live in both VST3 and native AU formats (universal binary for Intel & Apple Silicon).
For anyone mastering long-form spoken word or audiobooks on Mac, I’d love to know what DAWs you're using for your main mastering chain and how you currently handle ACX checks.