My Rossini and Clock have shipped

[Ermos (Erno)]

Correct. I have just re-read this:

Clocking & Multiple Devices

Correct, the external clock in a dCS system does not replace the internal clock in a dCS unit, such as a Rossini DAC; the external clock instead acts as a reference for the DACs on-board clock to work to. With that in mind, you want to isolate your reference clock from any kind of possible interference. This includes electronic noise, power rail variations, temperature variations and physical vibrations. All of these factors can influence a clock’s performance. Think about everything a DAC, U…