How to adjust ringer volume while listening to music? When listening to music on my phone (running Android 4.0.4 ICS), I am unable to adjust the ringer volume with the hardware volume controls. Pushing either of them adjusts the music volume and not the ringer volume.

If I hold down the power button, a menu appears that provides me with the choice of turning off the ringer completely, enabling vibrate-only mode, and restoring the ringer volume to its previous level. However, there appears to be no way to actually adjust the ringer volume level.

Am I missing something?
When an app is playing sound, Android will only adjust the volume for what is actively playing the sound (in this case the media volume). You can manually adjust your sound volume under Settings -> Sound -> Volume

If your ROM supports it, you may be able to enable expanded mode for volume under Settings -> Sound -> Volume Panel Style -> Expandable. This will give you a button to the right of the onscreen volume indicator (when you press the volume buttons). Press that and it will show all the adjustable volume levels and you can change it through there.