After receipt of today's updates (Debian Wheezy repos), the issue with sound in flashplugin-nonfree is resolved. If anyone is interested in tracing this to a particular source, I've included the list of packages which were modified today. Otherwise, please feel free to mark this bug as resolved or invalid.
Commit Log for Thu Mar 1 21:11:05 2012 Upgraded the following packages: accountsservice (0.6.15-3) to 0.6.15-4 anacron (2.3-14) to 2.3-15 eject (2.1.5+deb1+cvs20081104-9) to 2.1.5+deb1+cvs20081104-10 gimp (2.6.11-8) to 2.6.12-1 gimp-data (2.6.11-8) to 2.6.12-1 gir1.2-accountsservice-1.0 (0.6.15-3) to 0.6.15-4 gir1.2-javascriptcoregtk-3.0 (1.6.1-5+b1) to 1.6.3-1 gir1.2-webkit-3.0 (1.6.1-5+b1) to 1.6.3-1 libaccountsservice0 (0.6.15-3) to 0.6.15-4 libfile-which-perl (1.08-1) to 1.09-1 libfribidi0 (0.19.2-1) to 0.19.2-2 libgimp2.0 (2.6.11-8) to 2.6.12-1 libhttp-daemon-perl (6.00-1) to 6.01-1 libhttp-message-perl (6.01-1) to 6.03-1 libjavascriptcoregtk-1.0-0 (1.6.1-5+b1) to 1.6.3-1 libjavascriptcoregtk-3.0-0 (1.6.1-5+b1) to 1.6.3-1 libpng12-0 (1.2.46-5) to 1.2.47-1 libpng12-dev (1.2.46-5) to 1.2.47-1 libpulse-dev (1.0-4) to 1.1-3 libpulse-mainloop-glib0 (1.0-4) to 1.1-3 libpulse0 (1.0-4) to 1.1-3 libsamplerate0 (0.1.8-2) to 0.1.8-3 libtag1-vanilla (1.7-1) to 1.7-2 libtag1c2a (1.7-1) to 1.7-2 libtagc0 (1.7-1) to 1.7-2 libwebkitgtk-1.0-0 (1.6.1-5+b1) to 1.6.3-1 libwebkitgtk-1.0-common (1.6.1-5) to 1.6.3-1 libwebkitgtk-3.0-0 (1.6.1-5+b1) to 1.6.3-1 libwebkitgtk-3.0-common (1.6.1-5) to 1.6.3-1 libwww-perl (6.03-1) to 6.04-1 monodevelop (2.8.6.3+dfsg-1) to 2.8.6.3+dfsg-2 monodevelop-nunit (2.8.6.3+dfsg-1) to 2.8.6.3+dfsg-2 monodevelop-versioncontrol (2.8.6.3+dfsg-1) to 2.8.6.3+dfsg-2 pulseaudio (1.0-4) to 1.1-3 pulseaudio-esound-compat (1.0-4) to 1.1-3 pulseaudio-module-gconf (1.0-4) to 1.1-3 pulseaudio-module-x11 (1.0-4) to 1.1-3 pulseaudio-module-zeroconf (1.0-4) to 1.1-3 pulseaudio-utils (1.0-4) to 1.1-3