Difference in sound between copper and silver digital cables?

No.

Yes.

My mom used to tell me you just can’t help some people. Seems she was spot on.  Still a great place this Agon! What can one possibly do after spending years and thousands of hours building, testing, listening then building again with various conductors just to have someone say all I have leaned is not true and a result of my flawed person and weak mind. What I do is smile and forge on. It’s what we all have to do.

Copper is warmer with better midrange defination silver has better high end defination usually.

" If one doesn’t honor the inherent directionality of wire and cryogenically treat the wire then he cannot compete in today’s marketplace. In fact he can’t compete in yesterday’s marketplace. "
  I love science fiction and read it all the time. Today we regard the Mighty Wire.
  You know there is a correct way to run cables that is metal neutral to your speakers, right? Allow me GK to reveal the secret to you. You wash your clothes and then put them in the dryer where left to their own devices get wrinkly. I was looking at this one day and it dawned on me that just as you could put things in your dryer to stop this it could be done with speaker cables too.
  After a LOT of research I determined that if you made a clockwise air core coil of exactly 57.5" long out of 12g anything, then had a run of precisely 12" straight to a counterclockwise coil built just like the first one it took all the harmonic static out of the line.
  It was not the complete answer though as through further research I discovered that I was still left with sibilance and that cable cooking ended that. I have not tried many different coil winding sizes but I wonder if you were to wind a set tightly and put Precious Pebbles into the core of the coils how that would work?