The SourceForge project page at sourceforge.net/projects/emacs-vr-mode which is where you will find the files to download.
The VR mode e-mail lists:
Web interface to the VR mode CVS repository
To check out a copy of the current CVS sources, do:
cvs -d:pserver:anonymous@cvs.emacs-vr-mode.sourceforge.net:/cvsroot/emacs-vr-mode login
When asked for the password, simply press return.
cvs -z3 -d:pserver:anonymous@cvs.emacs-vr-mode.sourceforge.net:/cvsroot/emacs-vr-mode co vrmode
There is a (pretty rough) schematic of how VR mode works, that you can check out if you're interested. The Black corresponds to existing VR mode functionality, the red to changes necessary to get it to work with VoiceCoder, or at least an idea thereof...