ADG1613 - how to handle the GND pin in mixed signal designs?

I'm about to use the ADG1613 in a single supply audio / mixed signal design. Vss is connected to the analog ground (0V), Vdd to the analog power rail (12V in this case). There also is a virtual GND for the opamps of the circuit (6V). The digital part consists of a microcontroller with a seperated 3.3V supply.

Now I'm wondering about the GND pin of the ADG switch. Should it be handled as a return path for the logic control inputs like a "digital ground" pin on an ADC? The datasheet entry is: "Ground (0V) Reference", which sounds more like a reference point where analog and digital ground is connected.

So I'm a little confused, may be someone can help me with this question?

Thanks a lot,

Mathias