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[JONCAT]

Why doesn't Replay Gain analyze the average RMS for the audio files; wouldn't this result in a more accurate "smoothness" in audio levels?

Just because there is a forest with a few tall trees doesn't mean it is as dense as a field of grass.....(my attempt at analogy : )

JC

[Myron]

How exactly does MC compute the Replay Gain figure today?  I've always wondered but never asked.

If its using a simple average then there's no benefit to using RMS if you assume the crest factor of all your music signals is similar.  If crest factor varies greatly then RMS would be better.

[Matt]

Replay Gain is more advanced than a simple RMS number. 

Try a google search for a technical explanation of replay gain.

Cheers.

[Myron]

Replay Gain is more advanced than a simple RMS number. 

Try a google search for a technical explanation of replay gain.

Cheers.

You're right, this is a fairly complex problem.  I guess the complexity is unavoidable once you get into psychoacoustics.

So does MC use something similar to the four step process described on the hydrogenaudio site (http://replaygain.hydrogenaudio.org/contents.html)?

   1. Equal Loudness Filter
   2. RMS energy calculation
   3. Statistical processing
   4. Calibration with reference level

I can see that MC gives the user the option of selecting what hydrogenaudio calls "Radio" and "Audiophile" Replay Gains with the playlist and album leveling slections.