That seems to go away after applying RMS Normalise, limiter etc.
That’s what mastering does. You can’t announce directly into ACX—or you can’t do it more than once.
Apply the tools in order. They affect each other. The Equalizer pre-conditions the sound so the other two, RMS Normalize and Limiter, work right.
You may have hit it. The whine is so far down in volume that it’s not obvious even after mastering. This is you.
See? Two limits and one range. Peak has to come in quieter than -3dB, and noise has to come in quieter than -60dB. RMS or loudness has to be between -18dB and-23dB. Everything is exactly correct—after mastering.
I remember from up the thread you’re doing all these tests with the laptop in good behavior. What happens when it gets warm and the fans pick up steam?
Also a note: It’s possible to send ACX a test. This is very highly recommended if this is your first work. No, it’s not a good idea to finish the book and only then find that they hate it. This is a partial commentary and user post:
Koz