I had a similar problem with SX at first,
Do this:-
Load the Midi file,
make sure you have the right MIDI channel out setup on SX, to corrispond with the virus global channel,
the important thing, is to turn of Midi-Clock in SX, and untick Sysex in the midi filter (in preferences)
let the whole midi file play right till the end,
now check your banks a&b
C..