Hi zedman,

It seems as though you're trying to do this the hard way.  You should just be sending the expression pedal control over MIDI CC like you are doing.  But you shouldn't have to do any specific knob MIDI CC programming.  Just save a TF preset with expression pedal mapping like you normally would if you weren't using expression pedal over MIDI. 

That is, once you confirm you're getting expression pedal control over MIDI, move the expression pedal to heel, and when the algorithm light blinks on the TF, move the knobs where you want them to be at  expression pedal heel.  Then move the expression pedal to Toe, and when the algorithm light blinks, move the knobs to where you want them to be at Toe. 

Let the pedal presets handle the complexity of expression pedal mapping, that's what they're good at 🙂

Does this help?