Great to hear you got this sorted reasonably easily.
I've been following the other topics about controlling Totalmix mainly just to see how others are doing things. I ended up purchasing an ARC USB a couple of weeks ago and it is a perfect solution for my needs. I can control all my mic gains, phantom power, Ambisonic monitoring and headphone monitoring and switch between various recording and mixing setups at the press of a button and spin of the dial. Well worth the money for me.
I love being able to control things without even needing to have Totalmix open but I can show and hide it with one button press when needed.