Volume Lock will keep your volume locked at whatever it is when the lock is set. With this application the sound of your device can be set at a specific level and never changed. You can use this app to ensure that the volume of your device does not get accidentally raised or lowered.
Press the button in the middle of the screen to lock the volume, press it again to unlock it.
This application will only lock your Alarm, Media, and Ringtone volumes, not any others.
Volume Lock Screenshots