As Mohammad mentioned, this is a change that you would have to apply with console commands and is out of the general possibilities of the Max2Play web interface.
The quickest way to find this solution would be to ask the creators and users of the aforementioned VU-meter over at forums.slimdevices.com.
You can find the directory for the Jivelite skins at /opt/jivelite/jivelite/share/jive/applets/
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