Well, SOtM USA quoted me $350 for the aditional master clock input and I won’t do it. Originally was $200 when I bough the SMS-200 Ultra Neo.
My experience is that the closer the clock to the DAC the more impact it makes. So, I use the three outputs of the master clock for the DAC, the DDC and the Uptone ER.
I think there are better ways to improve sound for the money as I would also need to spend on a clock with more outputs.
$350 + a new clock is too much.