Windows users can now use VLevel in the form of a plugin for the popular Foobar2000 music player. I'd like to thank wore for getting the ball rolling and ssamadhi97 for writing a configuration GUI. To use the plugin, put foo_dsp_vlevel.dll in C:\Program Files\Foobar2000\components, run Foobar2000, and under Preferences... DSP Manager, add VLevel to the chain.
There's also a beta WinAmp plugin, which at this point has no GUI. (Help would be appreciated.) Unfortunately, WinAmp's plugin interface isn't as flexible as Foobar2000's, so the plugin will cause a delay in playback.
When the plugins are more polished, I'll release VLevel 0.6. I still hope to make a cross platform drag-n-drop interface to VLevel, but it's not as urgent now that Windows users can VLevel on the fly and even burn CDs using Foobar2000.