Just open Precision Volume, hit play, and adjust each song to a comfortable volume as you're listening 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 will automatically recall the volume you used last time you played that song.

Precision Volume has also been tested and can boost the volume of the iPhone or iPod Touch on many (but not all) speakers, and headsets!

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.

In addition to having complete music player functionality, Precision Volume automatically remembers the song shift of each piece of music that you play from your library.

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.

In a loud airplane? Trying to rest while listening to music quietly?
Then just adjust the master volume up or down to a comfortable level!