The developers of Pocketshield have came out with their own volume control that has range of features and abilities, available for less than $10. http://volumex.jdbp.mobi/

Features overview

- Set your default(standard) volume.
- Volume quick timer to auto revert to your default volume.
- Volume reminders, so you never forget to revert your default volume back.
- Auto silence/vibrate/maxvol when a specific appointment starts, and auto revert when ended.
- Auto mute all system sounds during phone calls.
- 100% finger friendly.
- Direct accessibility to both system and phone volume rockers on the same screen.
- Haptic feedback when changing volume.
- No more "tick" sound when changing volume.
- Option to lock volume sliders so you can change them together.
- Volume level preview.
- Change in-call volume supported.
- Skins/themes support.
- Windows Mobile 6.0, 6.1 and 6.5.
- VGA, QVGA, WVGA, WQVGA supported.
- Full integration with PocketShield.

...and more!