The Sound Check feature allows you to play all your songs with the same volume level.
To enable this feauture under your iPod nano, you must first enable it under iTunes.
- Open iTunes, select the Edit tab > Preferences > Playback > select Sound Check
- Connect your device to iTunes, synced you data.
- On your iPod nano
- From the homescreen, tap on Settings> Music
- Set the status of the "Sound Check" option to "On".