Well, it detects when the external clock is present - if I turn the clock off it switches to internal and if I turn it back on it reverts to external. But if I open cubase before the clock is on and then turn the clock on it doesn’t switch.
Cubase seems to know the sample rate of the ADDA though - if I change the sample rate on the converter (lavry blue) then I get a notification in cubase that the sample rate has changed, what it has changed to, whether I want to resample the audio in my project or move things around to reflect the new timing. Is that what you meant? (It asks this whether that check box is ticked or not.)
What I want is just to be able to avoid my forgetfulness - if I have the ‘externally clocked’ option ch3ecked then I want it to switch to external whenever the clock source is present, regardless of whether I turned the ADDA on before or after cubase launches…
Thanks.