Yes, using an S/PDIF, AES or SDIF-2 connection. If you are using a Master Clock, and these sources cannot be locked to it (i.e. no word clock input), you will need to set up a different path through the system to that used by the dCS Transport, USB or other clocked sources.
You can connect to the DAC directly and then set that input to Audio Sync.
You can connect directly to an Upsampler, set that input to Audio Sync, then connect another Upsampler output (for example an S/PDIF) to the DAC then set the DAC’s input to Audio Sync. To change sources, you will need to select the correct input on the DAC and Upsampler.