Hey
actually the odd thing is what you report about your other fx-units. Are those pedals?
I have plenty of racks fx, Eventide, Lexicon, Roland, Rocktron, Korg, TC, etc.—- all they send is SysEx.
A MIDI CC can only be generated if a machine OS provides the user an option to patch such MIDI data to a physical thing, like encoders, switches, foor switches or external pedals to be sent out.