As is it doesn't seem to work. When I changed it as you suggested to cycle through 64, 65 and 66 it does work.
I'm a complete novice at this, so I'm not sure how to troubleshoot it myself.
To give a bit more detail, I'm basically just wanting to start and stop the transport in beatmaker 3 with my sustain pedal. I've selected midifire as the input in bm3 and it's picking up CC64, but not 65. If I change ASS KO to 3, then it does cycle through all 3 though.