Thank you for your response Eddie.
I want to stream (continuously) a 14 bit Expression message.
But I was not sure if there is a specific order,
considering the messages are very specific about their function/purpose.
I basically wrote my drivers to look like this:
Send_MIDI_Message(Control_Change, Channel, 0x2B, TempExprsLo);
Send_MIDI_Message(Control_Change, Channel, 0x0B, TempExprsHi);