I've searched high & low for something like this...Ever since I received my first multimedia keyboard with my ol' 630i ('twas a Saitek Eclipse II).
An on-screen volume indicator! Just like MAC OSX! Works on Win7 64-bit & seems to run as a 64-bit application!
3RVX - customizable with skins; Google search or just goto deviantART.http://matt.malensek.net/#/Software/
Hope this helps someone.