Late Night Equalizer:
Apple has added a new equalizer settings in iOS 6, which compresses the dynamic range of the audio output, reducing the volume of loud passages. You can use this setting while going to bed or when you‘«÷re listening to music on an airplane or in some other noisy environment (like for example, on a bike!!!).
You can enable the Late Night Equalizer setting by following these steps:
Go to EQ under music in settings. Find "Late Night" and select it.
This will compress the music so that you won't have to live with:
--setting volume to hear comfortably but not hearing the soft passages, (then you end up turning up music and killing your ears...).