Fault on the "continuous" controller probably a case of RTFM
From a Fender Cyber amp manual
If "The unit is not responding to any MIDI continuous controller messages
from external devices...
Make sure the continuous controller numbers matches the value in the UTILITY
menu or is one of the predefined numbers listed in the appendices."
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/