Hi Geoff,
It would make things easier if you can post a link to your rack here on ModularGrid. That way, we can click on it and review it easily.
Do you have ADAT on your PC? The ES-3/6 combo is very specific. Most people connect to a PC with an ES-9 as it provides USB. For MIDI, MutantBrain is a popular option as it provides more connectivity pretty cheaply. When you add the CVx to the uMIDI, you end up more expensive.
Ears is discontinued so hurry to find stock if you really need it!