There would appear to be an issue with the MIDI control of the expression pedal input, as reported by Mr Loaded6String above.
The result is that MIDI pedal changes appear as normal on the display, but cause no audible effect. A quick solution is to put an unconnected 1/4" plug (no resistors required) into the pedal jack on the back of the unit.
This will be fixed in the next release, but the workaround is easy.
