Charlie: what do you mean by “src?”
If you mean a sample rate converter, since the machine doesn’t really have a "normal" digital input apart from usb-c, the usb-c sample rate is set from the connected computer.
Since the only digital output is that *same* usb-c port, the same sample rate would apply.
Unlike other machines which have both a dedicated digital input and output in which you might want to input 96 and output 44.1, the mixpre series can’t do this.
So no, the Mixpre series doesn't have a mode in which the machine can act as a stand alone sample rate converter.