some progress on a prototype/testbed:
the main thread seems to be here: http://www.diyaudio.com/forums/analog-line-level/167977-volume-remote-control-module-pga-2311-a.html

the main thread seems to be here: http://www.diyaudio.com/forums/analog-line-level/167977-volume-remote-control-module-pga-2311-a.html