10dB to -6dB should probably be your target average levels. Your final audio should not pass the 0dB level at any point (peaks). MultiMeter is a multiband (32 bands) meter to measure RMS and Peaks as well as Correlation (useful in determining phase issues, "stereoness", and stereo balance, etc.). MultiMeter is a passive plugin and just measures output, so if used, should be last in the plugin chain. And quite possibly your very best friend is the MultiMeter (Audio > Specialized). The adaptive limiter should be last effect in the chain. (Put it inline before the adaptive limiter if using both). There is also a multiple band compressor (called Multipressor) available. You can raise the low levels of the incoming audio and limit how much overall gain is applied to the high levels of the outgoing signal. There is a very nice audio plugin in FCPX: Audio > Levels called Adaptive Limiter. Make boost adjustments (compression/limiting) at the end of the process (in FCPX). All instruments should have good, positive correlation. Get some decent output from your DAW that isn't normalized to bring into FCPX. there's no indication what the peaks are, the average RMS or anything else since the final audio depends entirely on the original source.) ("Normalized -2dB" or "normalized to -0.30dB for YouTube" are meaningless statements. Either way, your audio can become damaged. Going down you run the risk of cutting out low (quiet) signals completely. Normalization artificially raises (or lowers) the gain of all the *entire* signal to reach an AVERAGE peak level (therefore, already "loud" segments will be clipped if there are very quiet segments in the music if you're normalizing louder.) Normalizing does not change the shape of the overal audio signal - it just moves it up or down. Did I mention you should never normalize? Also, you shouldn't be using MP3 - uncompressed, either AIFF or WAV, 24bit/48K if possible (although 16bit and 32bit float are usually acceptable.) You should never (never, ever) normalize audio. What DAW are you using? (Audacity?) If you experience clipping in FCPX, your audio is already clipped. If you can't get rid of the clipping, your original audio is clipped. If Final Cut really makes the audio louder (which would be very strange), I'll have to find out by how much exactly. I'd rather have it normalized to -0.30db for YouTube. The thing is, I don't want to just turn down the volume of everything, because if it's a music video (just an example), you really want the audio to be normalized to the full extent, -2db is WAY too much as a compromise. So what software do I trust? Do I just use the audio as is and ignore the clipping in FCPX (it's not audible)? Is it just a visual thing to force you to work below -1db, but in reality the audio does not clip? Or does FCPX really make the audio that much louder? AND IT IS STILL CLIPPING on the audio meter!!! That's crazy! Right now I have an extreme case of this: the limiter in my DAW was set to -0.30db, when I imported into Final Cut, I instantly turned the audio down by -1db. Now I have searched for this problem, and the advice people usually have is to limit the audio, but that is not a solution, if you're using music (it's compressed and limited already). So I have had this problem forever: If I use normalized audio, regardless if it comes from any DAW or from a normalized MP3 track, in FCPX the audio level meter always shows extreme clipping.
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