Undoing MP3Gain should restore the mp3 data to its original gain. Yet, if you have also replaygain tags, those are probably calculated from the mp3gained data, and so, be incorrect once undoed the Gain.
...I figured that 92db would be a pretty good level to compromise.
...so the gain I'm applying is almost always making the songs quieter.
Since MP3Gain applies the same gain-change to the whole file... Most likely, you are just perceiving the volume reduction as compression.
But actually, if you don't have "Don't clip" selected... You can get clipping, and clipping is a bad-kind of distorted-compression. I kind-of doubt that's what's going on.
Quote...I figured that 92db would be a pretty good level to compromise.The higher your gain setting, the more likely you are to clip (or do nothing). The default setting of 89dB works pretty well for me. I mostly play my songs randomly, and just about every time the volume sounds "wrong", I find that ReplayGain was not applied. (I've been using ReplayGain rather than MP3Gain.)
What exactly is the difference between ReplayGain and MP3Gain? I heard ReplayGain mentioned as an algorithm for calculating the gain, but I also read somewhere that MP3Gain *uses* ReplayGain...
Mp3gain modifies the data (losslessly) to make the sound louder or softer in steps of 1.5 dB. Replaygain does not modify the data but instead adds a tag that specifies how much the player (if it is one that implements replaygain) should adjust the volume. Replaygain does not have the 1.5 dB step sizie limitation.
The only true reasons behind the OP's experiences are not comparing before and after at the same volume level (if MP3Gain attenuated a track then the playback volume needs to be reduced by the same amount when the MP3Gain is undone!!!), Fletcher-Munson, specifically the way equal-loudness curves flatten with increasning level, different listening environments and expectation bias.
ReplayGain and MP3Gain do not in any way, shape or form apply compression.
I suppose another possibility is that a DRC plugin and palyback gain was configured in foobar2000. This would have to have been done by the user as it is absolutely not done by default and/or behind the scenes by the player.
Regarding RG tags coexisting with MP3Gain tags, whether the RG tags are right or wrong depends on when they were calculated. If they were calculated and added before MP3Gain made an adjustment then they will be right when the adjustment is undone. If they were calculated and added after MP3Gain made an adjustment then they are only correct for that particular adjustment. My guess, however, is that separate RG analysis was actually never done and as such RG tags were never written.
The OP should read about RG and MP3Gain from discussions and HA wiki articles before making further bogus claims about DRC or changes to EQ. Providing samples is not necessary. They are not going to support these claims.
The "not comparing before and after at the same volume level" is confusing. If I apply the MP3Gain attenuation, then of course it's at a different volume level. How can you have a "before and after" without any changes in the volume level?
I said it sounds like it's being run through a compressor. This could be a matter of interpretation, completely relative to how my own ears are hearing this
QuoteReplayGain and MP3Gain do not in any way, shape or form apply compression.I never said that they do.
So when I applied that level of gain to the collection (using Track Gain) and began listening, a lot of songs sound like they're ran through a compressor.
I don't know how MP3Gain works in conjunction with ReplayGain or when in the process, the changes occur.
I don't know why this is the case, but I know what I'm hearing.
Fletcher-Munson, specifically the way equal-loudness curves flatten with increasning level, different listening environments and expectation bias.