Do I need a control computer for the DiGiCo console link?

It depends. Details can be found here: KLANG DiGiCo Console Link

1st generation KLANG processors :fabrik and :vier always require a computer running KLANG:app for the console integration.

2nd generation KLANG processors (:konductor, :vokal, DMI-KLANG) can run a standalone console integration (KOS 5.5 required).

If a cascade of KLANG processors is used, it also always requires a computer running KLANG:app for the console integration.