ACX requires the file measure between -23dB and -18dB RMS and have -3dB peak values and a maximum -60dB noise floor.
That's not quite correct. Yes, you have to hit RMS (Loudness) between -18dB and -23dB, the other two are open-ended extremes.
Noise no louder than -60dB when you stop talking and no peak louder than -3dB—ever. ACX-Check is correct.
Are you using SetRMS? Depending on how old these posting are, we changed the recommended process. We never had a good way to force RMS values where we wanted them. Steve wrote a tool that does that, so the process is a good deal shorter than it used to be.
The golden chalice is to read in a very quiet, echo-free room with a terrific microphone and not need any
processing past overall volume. I can do that and we recently had a poster who could do that. Live reading will always need a little volume adjustment because the specifications for reading and posting are different.
If you're not using SetRMS, it's still possible to hit it with the other older tools, it may just take a bit longer.
I need to drop out for a bit. It may be easier if you post a sample of your work on the forum.http://www.kozco.com/tech/audacity/Test ... _Clip.html
You may not have to change anything since you've been shooting for the wrong standard.