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Looks like it is enabled by default.
It checks the music that you play, and adjusts the play volume, with the result of consistent volume from one song to the next.
"sounds like" a Good Thing™ to me...
So, I will leave that setting on. Thanks for the tip!
 
I have it switched off. All it alters is the gain of the track. The perceived loudness track-to-track will still vary, due to different mastering.

If you want consistency, the "late night" EQ setting does a superb job of controlling levels, as it's essentially a light compressor.
 
I have it switched off. All it alters is the gain of the track. The perceived loudness track-to-track will still vary, due to different mastering.

If you want consistency, the "late night" EQ setting does a superb job of controlling levels, as it's essentially a light compressor.
Out of curiosity, why do you have it switched off? I actually don’t want any EQ applied to my music or have my music or its dynamic range altered in any way so I wouldn’t use the late night eq mode. With that being said, not having to constantly raise or lower the volume of songs which is what Sound Check seems to be made for is a good feature to have enabled, Am I wrong? I mean, what is a negative of having sound check enabled? I’m here to learn so I’d love to hear it.

If the perceived loudness track-to-track will still vary due to different mastering then what does Sound Check actually do?
 
Normalisation adjusts track gain, without affecting dynamics.

I like a bit more consistency track-to-track, which you just can't get with normalisation, which is why I use the late night EQ.

Two tracks can have the same gain, but the other may sound louder due to mastering...which is where late night EQ can help.
 
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