in reply to how to mute system volume under windows 7

You found the MS docs/method & you surely know how to read the docs for Win32::API, namely, perldoc Win32::API.

So now, try to write the code. If you succeed, ++; if you end up needing help with some specific problem or failure issue, show us the code, the warnings and messages and the log-entries if any, and tell us where the result falls short of your needs.

That way, you learn something, and we get to help with a specific issue.

Come, let us reason together: Spirit of the Monastery