Ran across this. maybe those of you with older Murfs can get the interface for clocking for yours.
http://cgi.ebay.com/Moog-MuRF-MF105-Moogerfooger-Pedal-Midi-Converter_W0QQitemZ220463560364QQcmdZViewItemQQptZGuitar_Accessories?hash=item3354a6f6ac&_trksid=p3286.c0.m14