TaskBomb is a task scheduler for Android that lets you automate apps.

Volume Changer

This add-on allows you to set volume levels or change them by a certain amount. This is especially useful for things like scheduling your phone to mute or gradually increasing its volume. Of course, since it’s a TaskBomb add-on you’re able to build schedules containing these volume changes and many other tasks (like playing music).

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How to use

This add-on is basically a little app, but you don’t run the app itself. Once you install this add-on, “Set volume change” will appear as a choice in the “Data” field of a task definition.