Volume control/volume remembering app: Precision Volume
I just found this cool app called Precision Volume that remembers the volume you use for each song, while still allowing you to change the master volume for loud places like airplanes or soft places like when you're going to bed.
The app can be found on iTunes here: iTunes Store
The description is included below:
Precision Volume solves the problem of having songs in your library with different volumes and prevents you from having to adjust the volume between each song.
Just open Precision Volume, hit play, and adjust each song to a comfortable volume using either the in app song shift slider or the external volume buttons on your device.
The next time you play that song, PRECISION VOLUME AUTOMATICALLY RECALLS THE VOLUME YOU USED FOR THE SONG THE LAST TIME IT WAS PLAYED.
HOW IT WORKS:
The volume used for each song is simply calculated by adding the Song Shift for each song to the Master Volume, making it easy to adjust the volume across all songs for loud or quiet situations using the Master Volume, while also remembering differences in volume between each song using the Song Shift.